Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d7661cb39da07d…

MALICIOUS

PDF

44.1 KB Created: 2020-08-19 18:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96a962168d6daf060d89b27eb121a33 SHA-1: bc0138d93df2f1eaf2a3673c4aacf0c88e3fa5e1 SHA-256: 64d7661cb39da07d2ecb1492ba33f0e4ba933977b7338a20897f7f83cf68b07d
154 Risk Score

Malware Insights

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

The PDF contains a "cover up method worksheet" lure and a significant number of embedded links, many pointing to potentially malicious redirectors. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to lead users to external, potentially harmful, content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/pify?keyword=cover+up+method+worksheet
    • http://rojexi.amaranthineartist.com/uploads/1/3/1/3/131382406/miboxenovopeza.pdf
    • http://files.ahealingplacespringfield.com/uploads/1/3/2/8/132814086/zebukabeborojiro.pdf
    • http://voroj.stevescustomtattoos.com/uploads/1/3/1/8/131856706/84c35b2b8f.pdf
    • http://wufevurum.minnesotaironwoman.com/uploads/1/3/2/6/132681337/rigamodovavalepajof.pdf
    • http://files.janvantblik.nl/uploads/1/3/2/7/132740362/ziwifej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/95553681619.pdf
    • https://cdn.shopify.com/s/files/1/0434/1265/2194/files/92646542725.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/gogusegorexit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/74565434167.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/kiseniraji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7191/files/biceps_tear_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/candide_voltaire_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/12514712460.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/vunajirutoxizafukatatas.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_off0000692d.bin
8fb9a0bd62b00dc0165b24257ecd0d3b0aa1126388a52a1593c35a9949c1d357
pdf-font-stream PDF embedded font (sfnt) at offset 0x692D 5080 bytes
font_01_sfnt_off00007a65.bin
f6e00e2fb95e0f03d493387c4bb91bf189baeaadc3ebfe6cb49cd297714f972f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 12040 bytes