Malicious PDF — malware analysis report

Static analysis result for SHA-256 773371c196a1940b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-04 13:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 520b8f8098763941ae15790cfd042bfc SHA-1: ef78256ac87e644061d3d323cedf30f9a014d234 SHA-256: 773371c196a1940b216620409407e91745cb6485f4773db5c0329b3ff21b37cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious link identified leads to a known redirector infrastructure, suggesting an attempt to lead users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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/pify?keyword=behaviour+management+strategies+primary+school+pdf
    • http://files.hpdowntown.com/uploads/1/3/1/1/131164574/9be2e0052efa11.pdf
    • http://files.riotbread.com/uploads/1/3/1/3/131380596/990959bfc32995d.pdf
    • http://files.jcarpentertherapies.com/uploads/1/3/2/8/132816036/4072555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/zajaretim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/27335540484.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/wedaxudiwinigozopuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/equidad_de_genero_en_el_ambito_laboral_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/95080670553.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/51004666499.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/92085715188.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/xosojewuwuwagojis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/86516038143.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/77770554913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4743/files/beruseluretinajipilow.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/5392954057.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/kenshi_crossbow_required_skill.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000658c.bin
800a4b678d31f58ff8113443154253ebc4d785ea3dedf905c226ba364c0396ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658C 5780 bytes
font_01_sfnt_off0000791f.bin
53e9c793c80ee5870a751f9b99cda71fc31879f207033a562d2437e03f9fbca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 9928 bytes

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