Malicious PDF — malware analysis report

Static analysis result for SHA-256 248f3efe1e3caab7…

MALICIOUS

PDF

46.3 KB Created: 2020-07-29 14:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dffc0bc3e72543cf91057a0720836d4a SHA-1: f5889868e477fb94018232a6c7ec664b77442d36 SHA-256: 248f3efe1e3caab7f978d902ac1f82a24eadcdebeab7b0721e940510a37b0c5c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a malicious redirector link (ttraff.cc) used in conjunction with a search keyword, suggesting a phishing or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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.cc/pify?keyword=the+logical+thinking+process+pdf+download
    • http://files.quantumae.net/uploads/1/3/1/6/131637546/6178593.pdf
    • http://files.fifthandfederal.com/uploads/1/3/0/8/130873715/tabafu_liwajaduwapazal_bibonugobab.pdf
    • http://files.shearserenitysalon.net/uploads/1/3/1/3/131379759/8772874.pdf
    • http://files.allthatglitterscompany.com/uploads/1/3/0/7/130739789/634e7e.pdf
    • http://files.cupparosielee.com/uploads/1/3/1/8/131872138/9038fde.pdf
    • http://files.fifthandfederal.com/uploads/1/3/0/8/1308
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/deweputililirope.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7365/files/mivowamenixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/garipaveromidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/lelepiritunuvebu.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/99681979247.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/85647797027.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/susupofumito.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/vuvapolofapidu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/xufulokaxapogimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/92033025864.pdf
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/jomejojes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/gulokadigulomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/xiviz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7672/files/kanusugav.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/11827074154.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000773e.bin
452bfeaef9ee12f2f214aed4b1088b0968924a7b53409a275fca73b937e01ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773E 5312 bytes
font_01_sfnt_off00008955.bin
a3d362fda15635cacb4a67836b8efe7bbc1b213213962fb8db4ffc950f635bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8955 10108 bytes

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