Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f7f41e6ab6ea3f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 15:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b8cd6d498beb948e7d1bd4784ffd28 SHA-1: 3f9cf7ebf31e90ac2e3de41cb009fa5b6172d938 SHA-256: c3f7f41e6ab6ea3fac9aff0164d6e15dcda01a1d08a209471f312a63bf1e5381
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=alwyn+hamilton+hero+at+the+fall+pdf, which is likely used to redirect users to further malicious content. The document body itself is heavily obfuscated and contains what appears to be a reconstructed URL, but it is too corrupted to be certain.

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/pify?keyword=alwyn+hamilton+hero+at+the+fall+pdf
    • http://files.translatorquote.com/uploads/1/3/2/6/132681337/pabuwawis.pdf
    • http://xoloxado.ecorocca.com/uploads/1/3/1/6/131637316/telivudegutav.pdf
    • http://files.lawrencemjackson.com/uploads/1/3/1/6/131606822/2231925.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/fararaxanidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/wususepezatozetekimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/gadefuvidiborelunexipul.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/accounting_policies_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/lifelopozuvasizagotusanim.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/82032152328.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/japanese_the_manga_way.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/93909881909.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/voweniwugulekidux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/wipozimalojuxadesot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6852/2657/files/58247007357.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/63364211947.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_off0000637f.bin
346e4fdf7c9ecc80fe1129c3f0e9f1555fc25acdd6adbbf726fcf91f722e91ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 5288 bytes
font_01_sfnt_off00007566.bin
c0f5e52be5810d91562c4d0fdd41c5320e18fe7b153ed040a00de53947db161a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7566 9964 bytes