Malicious PDF — malware analysis report

Static analysis result for SHA-256 91774fc78f494480…

MALICIOUS

PDF

43.2 KB Created: 2020-09-04 06:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2261157420d08f749048d3f3b10b8cfc SHA-1: d415cf3c7979be18a11d23f2873158b92ce75f7b SHA-256: 91774fc78f49448088513689c56f411a541258c656736554c6ad08a266a6cb11
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/wix?keyword=bob+books+set+3+guided+reading+level', likely leads to a malicious site. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to benign Shopify files, suggesting an attempt to manipulate search engine results or distribute content. 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.me/wix?keyword=bob+books+set+3+guided+reading+level
    • https://cdn.shopify.com/s/files/1/0438/4705/7568/files/similar_triangles_problems.pdf
    • https://cdn.shopify.com/s/files/1/0460/0692/7527/files/sarcastic_spongebob_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/xuleloboselesuxidodadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/19976660417.pdf
    • https://cdn.shopify.com/s/files/1/0450/2755/7526/files/cours_espagnol_dbutant.pdf
    • https://cdn.shopify.com/s/files/1/0463/5498/9222/files/collisions_momentum_worksheet_4_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/nedevegosagepevuxijaxine.pdf
    • https://static.usrfiles.com/ugd/b8c837_937680b6f1a3469ab2879cf1bdcc4f27.pdf
    • https://static.usrfiles.com/ugd/eaf48f_b53274bb47904feeb29302530d0b3201.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8d42a2cdc334486ab30289d205be209.pdf
    • https://static.usrfiles.com/ugd/ea2f88_e3b0366cb1734c0095f94906895f013b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbac040239c144b69e7ab5f200ec356c.pdf
    • https://static.usrfiles.com/ugd/4bb894_f1f36c2e6d5e41b3b69d6c3f4c139ffb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e8dc1c3d41843349c66fd4d5ca0aa5b.pdf
    • https://static.usrfiles.com/ugd/af0aa9_cc69a449bb9a4281806d4c62c8fa8c98.pdf
    • https://static.usrfiles.com/ugd/ade4e6_75b5707cf6c3405ab319350af500b445.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_off0000611e.bin
09f6eee848dc5e90bbb30383fa6fa549a6b69dc82f09b3b61c195515876eca0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 5472 bytes
font_01_sfnt_off000073c2.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 1800 bytes
font_02_sfnt_off00007c4f.bin
bfcb1b54d56e1cbb061161712c4cdd857f692573edda607e17d6304a8076704c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4F 10244 bytes

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