Malicious PDF — malware analysis report

Static analysis result for SHA-256 b478b6d2da540f1c…

MALICIOUS

PDF

33.6 KB Created: 2020-08-11 00:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5ba41d6a025c2f041d9a9a7cc822af SHA-1: 702ed4169c7fa33578e5938b131f894676c49152 SHA-256: b478b6d2da540f1c60cee3d24910909af9027df7552b1d24032eb0416c56dcd1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure related to 'chords' or a book title, which is likely intended to trick the user into clicking the malicious URL. 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=because+you+loved+me+chords+pdf
    • http://files.mmorrisld.com/uploads/1/3/1/3/131379700/bifupat-mofabifajebew-govenavob-xipawebo.pdf
    • http://tunerevi.bluecrimsonanime.com/uploads/1/3/1/6/131606938/7da4f0255799e.pdf
    • http://files.charisacctservices.com/uploads/1/3/1/6/131606758/caf2cc85aa266e.pdf
    • http://files.vanityhairartistry.com/uploads/1/3/1/4/131437615/631203.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/the_alternative_introduction_to_biological_anthropology_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/contract_agreement_format.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/jotijopape.pdf
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/lujeluzejisudofalod.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/80259856237.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/bogewiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/ge_stove_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/nagidotulakifevabijov.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/42379119882.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/85515443994.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/dadotev.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_off000045c7.bin
fecc9d2cf02bc60343e485322477e42f7c2113f3371021e03a419b4577e8bca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C7 5608 bytes
font_01_sfnt_off000058b5.bin
c0142d085a1e8b5c3bc8b25bff36920820b5600bc903d73d5bd41d43d2d520fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x58B5 9732 bytes