Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9ef296b1295e50…

MALICIOUS

PDF

66.8 KB Created: 2021-01-24 06:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e5682c5a922ce28cce95d04e3acffba SHA-1: 90b70c7fbfd067e8ecc2d8a5a95f0e57520925a2 SHA-256: 4a9ef296b1295e5095faf0a00f30d15befd10d7146769348a2237345c842106a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links pointing to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The presence of SEO-related UTM parameters in the URL suggests a phishing lure for free downloads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=timex+dual+alarm+clock+radio+manual+t715 In PDF document text
    • https://cdn.sqhk.co/zipirevofu/iqghfij/stickers_for_whatsapp_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/Z3LEOF2/8231639434.pdfIn PDF document text
    • https://site-1172340.mozfiles.com/files/1172340/57838126308.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/idiaiji/quantum_leap_on_netflix_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/IhbjaLd/my_talking_tiger.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/cVMjdQm/how_to_make_a_popsocket_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/AJhfpvP/buxoto.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/sqjcmKh/hope_for_paws_rescue_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/hcigjei/acrylic_nail_shapes_square_oval.pdfIn PDF document text
    • https://site-1202168.mozfiles.com/files/1202168/68498687755.pdfIn PDF document text
    • https://site-1212518.mozfiles.com/files/1212518/s_letter_pics.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/jqjchi3/86929739393.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/TdYGyij/king_s_raid_ishi_wo_tsugumono-_tachi_frey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/kiwekelot.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/wazawimuvakubefa.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/cual_es_el_sinonimo_de_languidecer.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/5156310717.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 5244 bytes
SHA-256: 17b8e0868ab10bc8ed4c36198d0c03eecbfd6029b15c02f18b40de9348f92a84
font_01_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 10424 bytes
SHA-256: 481e35a51c8d72d1e8f20e3b02d7ab3ae5791fada70b0e83ac0bb0821294632d

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