Malicious PDF — malware analysis report

Static analysis result for SHA-256 656b542ad8d57fd4…

MALICIOUS

PDF

59.7 KB Created: 2020-10-23 13:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: ef817fe0987ae6c3ff984f41b2cd6930 SHA-1: 56a06cc68138db80d221e9b7687dd2f009941e23 SHA-256: 656b542ad8d57fd48e6c202c6b11647289a1310565831d69476942ced7be164e
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/pify?keyword=color+splash+effect+2020+apk In PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/5815877.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/virunuvesefeta.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/lefizusaguxajaz.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/100317.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/bonabuluza.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/jewedo.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/6651221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c22ec11c-d128-4a4e-9a7c-565c78fe6c61/22972915015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6e7451-b18a-428d-a4c2-1ceb56536987/divurabiwofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f423ee8-e6a1-4669-bb62-a52550c76271/seripezonit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84da0d11-cf93-4050-bedb-5863ba57155c/58020973376.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/tivufulinelabuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/vibobagamope.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/electrical_cable_insulation_types.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tumaropamexasaditemal.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/population_du_cameroun_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/59032721491.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/tennis_elbow_physical_therapy_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/ziguzoxezajifowimo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/flat_belly_diet_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/82787121215.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/73548895143.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000acc6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xACC6 20768 bytes
SHA-256: 3ebf76d07eb951e27bb3d6a8f6ddc757dd353a6485fc9b9971d4faf842fa3d46
font_00_sfnt_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5096 bytes
SHA-256: 438b4515c70edd03d7d0915d3dd84c0484bccac20fec0bbd50fd3f9fad07e5fe
font_01_sfnt_off0000790f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 4124 bytes
SHA-256: 335c06a52dbdf85e6b2cb53c25eeb0693423d5c0b68860e909959675be9650bc
font_02_sfnt_off00008903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8903 10408 bytes
SHA-256: 9280d087edbaa4ae3eba24cfd22a14cc0e9304af7555ee7887dcbc1a5b9b46d5
font_04_sfnt_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e