Malicious PDF — malware analysis report

Static analysis result for SHA-256 7388547bb206e011…

MALICIOUS

PDF

36.4 KB Created: 2020-08-11 13:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 241d93d41b9b3d0d5b4981018950fb2b SHA-1: d98af239dac7311daf07000c5d02a9b90cf8c1fa SHA-256: 7388547bb206e0112b34261b8928c319256648a9eeec2672878786f49f43402e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify domains, but one critical link redirects to known malicious infrastructure via ttraff.cc. This suggests a phishing or scam attempt, using a lure related to 'book calculus of variations pdf'. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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=book+calculus+of+variations+pdf
    • http://files.mavismakes.co.uk/uploads/1/3/0/7/130740490/1242344.pdf
    • http://files.happysleepermattress.com/uploads/1/3/2/8/132816091/3919339.pdf
    • http://files.thesterlingcastle.com/uploads/1/3/1/3/131383949/xududitazut-mukimixuxajeku-vomavajal-vusumepesufed.pdf
    • http://files.miharijavec.com/uploads/1/3/0/7/130739004/gavuwifevape.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9510/4424/files/poroleta.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/17337683933.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/park_big_blue_book_of_bicycle_repair.pdf
    • https://cdn.shopify.com/s/files/1/0429/1844/5223/files/6297421535.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/93545564664.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/vomezovekumawoguloz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7240/4118/files/macroeconomics_19th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/kenaduviwufogiju.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/fonowogavefiko.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/pelojomivowawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5110/6972/files/zoserolatulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7482/8953/files/genidigaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/68650513997.pdf
    • https://cdn.shopify.com/s/files/1/0436/9838/9145/files/13559639350.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/41801447395.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_off00004fbe.bin
f07a7af621957c62557830553e7d82cc6d95162af81d59774dbfb061cafb9e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBE 5324 bytes
font_01_sfnt_off000061ea.bin
a5e609e8374528de3e0f3d962ca59886721b2816ee371eabd9fba4b297af7c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 10144 bytes

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