Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a034ae2765fcc0…

MALICIOUS

PDF

55.0 KB Created: 2020-09-01 23:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2feada9f6868631b9c2fcdb70297c140 SHA-1: c1cd7669be0da1dac7b5bfa3a23d44be4eb4e59e SHA-256: 80a034ae2765fcc0421afe8a308ec68852f0208833fb97853376249ad9625419
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which, https://ttraff.cc/pify?keyword=synology+directory+server+user+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many pointing to benign Shopify domains, indicates a potential SEO poisoning or link farm tactic to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=synology+directory+server+user+guide
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/baha_u_llah_and_the_new_era.pdf
    • https://cdn.shopify.com/s/files/1/0466/3371/3829/files/microsoft_office_business_plan_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/non_disclosure_agreement_template_for_employees.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/tagoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/85468165544.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/fejenovotamosijuf.pdf
    • https://static.usrfiles.com/ugd/9904c2_d2023e19186440418b242edc2f2e79de.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd683b0eeb184becba5b53404da3e5b5.pdf
    • https://static.usrfiles.com/ugd/912de2_ee8a467d03c2408c86f64bfc73867fad.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e6e44d4e4bf4eafb1fee7e3daa17d38.pdf
    • https://static.usrfiles.com/ugd/1cc777_a01195aed1454a11af148f1362d08315.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f2.bin
3d232c5a1ee188fae540dc621a7c508dfb4407c49bdfc07303360a9f51ede396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F2 5588 bytes
font_01_sfnt_off00007c78.bin
305ecb1ef89b5c058329038712e002bf84bf79159d745cb7223bcc5954455074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C78 5164 bytes
font_02_sfnt_off00008e1e.bin
593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1E 6640 bytes
font_03_sfnt_off00009fbc.bin
da5c8b7e7ca42184437d4f77a0bfb23361ec6f054abd373a64e850382d455192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBC 15060 bytes

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