Malicious PDF — malware analysis report

Static analysis result for SHA-256 172fb4bde0041a75…

MALICIOUS

PDF

47.3 KB Created: 2020-07-27 15:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eb74ca575344f2ded73be15657ab6a5 SHA-1: 9793ec88803b79437baf546a27ce0d64450d956d SHA-256: 172fb4bde0041a757ae9987bd96416681a9e2cb6cdfeb65e5138ffa17401ab4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.com). This indicates a link farm designed to obscure the final destination and potentially distribute malicious content or conduct phishing. The ML classifier also strongly flagged this PDF as malicious.

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=apa+annotated+bibliography+example+pdf
    • http://files.eastpennardchurch.org/uploads/1/3/0/7/130776795/juroruxu.pdf
    • http://files.socalfcboosters.org/uploads/1/3/1/8/131856904/jumupuk.pdf
    • http://files.johannes-keller.net/uploads/1/3/1/0/131071063/7acf55354ba53.pdf
    • http://files.fiteducationconsulting.com/uploads/1/3/1/4/131454238/89520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0913/9110/files/jisosofexuteparefujojew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/44485566753.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/15353943577.pdf
    • https://cdn.shopify.com/s/files/1/0432/5690/5885/files/poxaxevipafixekimuvixole.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/39490173766.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/wamefus.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/demexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/xadinudazokojikaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/81996496093.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/79049115945.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5619/files/laxafipuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/wusoxajolusuxoxigit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/kevanekibefovabutoxefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/67249737641.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_off00007aa6.bin
4ad533dab1d9238a0c8b6b9aac8e6add3e680a1376f7cb41cd5b48fd395f5d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA6 5364 bytes
font_01_sfnt_off00008cb8.bin
9ad41c2ec8101199825cfe1d5c786d849013527bd644a571e6c691e59c6b7d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB8 10444 bytes

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