Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd40ed2790dfa2b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-13 04:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17adbfc63dfc510321b1a28188865f22 SHA-1: 4f46099fbeaa7441477093753b40b79372df7847 SHA-256: 7fd40ed2790dfa2b0ae26b06298ab7dd2388dbd1007b848e0262a13edb59c1c3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a worksheet answer key. This indicates a phishing or social engineering attempt to lure the user to a malicious site. The document body itself is heavily obfuscated and contains numerous embedded URLs, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or content distribution network used to host malicious files. The ML classifier 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/wb?keyword=chapter%2011%20dna%20and%20genes%20section%2011.2%20worksheet%20answers
    • http://files.nwexplosion.org/uploads/1/3/2/6/132681836/5018335.pdf
    • http://files.esc-llc.com/uploads/1/3/1/3/131384279/weselonewugur.pdf
    • http://files.protectgladewatershed.com/uploads/1/3/1/4/131452733/611396.pdf
    • http://files.theandersonoutlook.com/uploads/1/3/0/7/130739180/79005.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/lomixorufunolevedejon.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/18424203709.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/14770395719.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/54241501963.pdf
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/fanasanojofivejuxabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/mukufutisit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/rofulijili.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/tovegakat.pdf
    • https://cdn.shopify.com/s/files/1/0454/4561/1678/files/business_management_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/6637002893.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/3696437192.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/zopifupetine.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/my_beloved_charioteer_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a3.bin
7d19a5397cbf6df8b072b3a4ae2ea9d7c61e049e7fd956c5f1a0d8f7ae27e643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5484 bytes
font_01_sfnt_off0000736c.bin
70bef4f64743e770142ce7f237c3910448b3c9c03daa840a08f032f7aaef3260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736C 10472 bytes
font_02_sfnt_off000096a7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A7 4324 bytes

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