Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e74ebea5a9d04b…

MALICIOUS

PDF

37.0 KB Created: 2020-09-04 03:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8d72af2b31a081b27239c34ff36075c8 SHA-1: 32b55ccaac243702055d6a0971da8c29083baba4 SHA-256: a9e74ebea5a9d04b4330366a35700c889047320145b9f5985f9e6ad4690eb691
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.com/wix?keyword=chroming+rose+heavy+birthday+audio In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99a8f2_0522ac9077db4e34b49eb640253b9eef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f967ac_eb5547cd3150406caddd69c1295e220a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d46dfc5edf7f4833a626abf19ee6e198.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0d002d_e0d1de23f5bf44c4b4a797dcb803dc96.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/sowadap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8427/5100/files/92847964630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/12944798440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2442/4870/files/40598865779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/bawivibixujerikapaxi.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bca722_16e3508a6fdd4578ab04045b18b6a16c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/40512e_d7b9092deb9e4a96bc89d839aca615f5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b48b60_05f26f18a84a4eb2bac06e20fcccf64f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3649d2_1bace75fa1a44be9b99381c2617124ef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4984/4890/files/sofufeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/0102/9279/files/badri_film_songs_kannada.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BB 5412 bytes
SHA-256: 31147d28d33846a7fac095175ea6a241048545a585ae5ba852621bb5e92d1100
font_01_sfnt_off000065fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FC 9732 bytes
SHA-256: 99de29e2682c3e34f02a0fb243ac9ee2cd8c074173d08021804caaaca3a8871c

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