Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e162c468f30277…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 02:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace18119c7829028e41746013b2b94f2 SHA-1: 39ce3d8c2ef3bb95c381a480d4608b1b55677dad SHA-256: 70e162c468f302774ac4c6a8be9056ecb9b2aa0afc5a5eefe40be3231c719bc0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, disguised as a search result for an engineering book, redirects through `ttraff.cc`, a known malicious redirector. This indicates a phishing or malicious redirection attempt, likely to deliver a secondary payload or lead users to a fraudulent site.

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=basic+electrical+engineering+book+pdf+by+abhijit+chakrabarti
    • http://files.honeycombloom.co.uk/uploads/1/3/0/8/130814594/vojebexuzigubitovas.pdf
    • http://files.bestmusicteacherever.com/uploads/1/3/0/7/130776065/d1becc61fc2b55d.pdf
    • http://fulibur.massachusetts-bankruptcy.com/uploads/1/3/1/0/131071157/d9a024403ac.pdf
    • http://files.katrinaleelifecoaching.com/uploads/1/3/1/4/131437930/1d92cbfecdb70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/benzoato_de_benzila_emulso_bula.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/71813184125.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/76025091379.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/kokuvawalikubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/valuvepenovuvagureriro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/67592846199.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/gufamuwutimobivaxar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8973/0472/files/dudasoxijimovenujatopibir.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/gesidebadafilorig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/podijenomob.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/56481440402.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053e3.bin
67fcc361a3f58721023a674d87af7b4e4ffb5188b211278e3806b0e52a89258a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E3 5848 bytes
font_01_sfnt_off000067d2.bin
3769229d7b7a258e49ff59ff1feb922f2caa8334d68c8262a219aba37701f9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 10308 bytes
font_02_sfnt_off00008b53.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B53 16168 bytes

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