Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c69da5fa8ccd923…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c2e5aeba27e933cef16c6fb46c9861 SHA-1: 85b70ac6cd4ebbecdc6768bd7dbcdb66a5feea84 SHA-256: 7c69da5fa8ccd923ba42e998e071890f6327bab38a4751210158d684f12c2d91
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, including a known malicious redirector, suggesting a phishing or SEO poisoning attack. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates the linking to external resources, which could be used to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wb?keyword=adaptation%20malinda%20lo%20pdf
    • http://files.fowleropebirding.com/uploads/1/3/2/8/132816036/9381833.pdf
    • http://files.lakequassapaugassociation.org/uploads/1/3/1/3/131398095/8736333.pdf
    • http://files.christyzigweid.com/uploads/1/3/0/7/130775232/gosaz.pdf
    • http://lukagik.compassionsfireministriesinternational.org/uploads/1/3/1/4/131406749/novebutidavazidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/65783765591.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/lukaviz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/720912377.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/kulitime.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/vudumesalibitusajaxojoge.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/duwitadejuxekafukoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/99887677560.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/45551660320.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/32216621850.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/wiroxos.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/46287810314.pdf
    • https://cdn.shopify.com/s/files/1/0430/3742/5813/files/28127433021.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_off00006657.bin
55393626a8f35427523e480273cf0a7b52bceb15df927e90c5a46c2000d7b34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6657 4904 bytes
font_01_sfnt_off000076fc.bin
9b4656a33190122af7e051c218239d0643caf24eb434550c3df1e31fcf77eb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FC 10052 bytes

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