Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c150dcc730eb1c7…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 01:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37dce9dae1822f7055350d12131005ca SHA-1: 29f02ec653500eae9b6b9b33a95cf617d87dffb6 SHA-256: 5c150dcc730eb1c7b9ec2b9d58ca04856030c636b7490ce41a602e7228d8d998
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ttraff.com/wix?keyword=dermnet+erythema+multiforme', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure.

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/wix?keyword=dermnet+erythema+multiforme
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0779a3_007728221b324037ba903a9dc476d000.pdf
    • https://static.usrfiles.com/ugd/b9801a_a7878fdafa8e44cea3d463b231492f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_40a3304c0d1e49b8b5dd1affce370d43.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ddc04b3d3224c8b907a8014768819ca.pdf
    • https://cdn.shopify.com/s/files/1/0432/4078/4035/files/stone_masonry_construction.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/87221929311.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5549/files/tanil.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/bihar_daroga_previous_year_question_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/fozukupobenimawabov.pdf
    • https://static.usrfiles.com/ugd/067ecb_8b46b8fb2b6048849d52ccad4efcd125.pdf
    • https://static.usrfiles.com/ugd/d54300_840fb9c37f744d74a20c224463b5f656.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_de2d8276635e4763b768a83ab77915f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f431d0c267a446a2b8d12eb174dee8af.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_580e9a0d2cc84946b11ff3dd6a516d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_44d1d516be284407893d7fb00f95a00c.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa4956cd0a6c44faac8d2f66fbb55a3b.pdf
    • https://static.usrfiles.com/ugd/2b3f46_7a01d28309c2421fbeb9cb18c59d5530.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_off00007061.bin
513413b435b79c9bae1733921fb3bf30f5ca8b68448b5129d9611c9803dafb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 4928 bytes
font_01_sfnt_off00008108.bin
b173ed65719d05e185dc802e6e51de9fee8030761a4930a6c3dda714ef74ebdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8108 10744 bytes

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