Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c9e95e91ebdd9f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 19:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee57d59b091ad61a15699263bf9526bc SHA-1: 6df969fd2b4553c309c0f11bbb804fd6999e14d9 SHA-256: 95c9e95e91ebdd9fc6bdd2c4dfb785577413c2a1a7ce0c353ecb6fdbcfcd014f
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware. The document body, though heavily obfuscated, contains keywords related to 'Samsung np300e5a drivers windows 7', suggesting a lure for users searching for specific drivers. The presence of numerous links to PDF files hosted on Shopify and other static hosting services indicates a link farm designed to improve search engine ranking for malicious 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.ru/wix?keyword=samsung+np300e5a+drivers+windows+7
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/34684040579.pdf
    • https://cdn.shopify.com/s/files/1/0464/7380/5982/files/82921080245.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/po_bank_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/51683455033.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/1264360045.pdf
    • https://static.usrfiles.com/ugd/b8c837_00599d8ac6fc4720becba405955ae7e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_feaca2158ed345b5a23ce8cb5d1b11aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_568de4dcaec448ea9f98eaad08b503d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8353486f17742b387d5f83487f42cb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c29ae1bceaaa479c8e4ea670a18e14fb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/nabiwoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/9486/0191/files/riesgo_biologico.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/sonupaxabewaga.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/reliabilt_sliding_doors.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_off00006104.bin
e60ca1a0547ae3d7d8fba420e5d5f822bc7546fc057a786bf1f049451cc790a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 6012 bytes
font_01_sfnt_off00007575.bin
9ed2e5df0e2b0665e6d751fd36b2763193bf7ac5748c58748a095110ff5bfa0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7575 14564 bytes