Malicious PDF — malware analysis report

Static analysis result for SHA-256 1895dddd2267cbcc…

MALICIOUS

PDF

47.2 KB Created: 2020-08-07 13:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96447851ddd92283eed2a35e536a821a SHA-1: fd8ea15b149a1512ef9228253b5113a8db1a9e18 SHA-256: 1895dddd2267cbcc8473d82eec6b9c8ecf57164d1190c6048124072dc3da9f1a
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a "maths formulas" PDF, likely a lure to encourage clicks on the embedded link. The link itself, https://ttraff.cc/pify?keyword=maths+formulas+upto+class+12+pdf, points to infrastructure known for malicious redirects.

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=maths+formulas+upto+class+12+pdf
    • http://files.roofingfayetteville.org/uploads/1/3/1/1/131163613/fca1689.pdf
    • http://files.kuwaithomeschoolleague.org/uploads/1/3/1/3/131380158/jedoroxulor-suxagemupid.pdf
    • http://files.hattology.com/uploads/1/3/1/4/131409677/7961756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/74114666010.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/wizalaxuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/jowirurejudopifelo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/18015509425.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/sprinter_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/90730468770.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5750/files/sisulifapupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9425/files/honda_trail_50.pdf
    • https://cdn.shopify.com/s/files/1/0438/3024/7584/files/balotario_mtc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/python_round_float.pdf
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/probability_brain_teasers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/pengertian_atheis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.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_off00006ebe.bin
ae321c6d76c9f27fbc38be8fcab867a56eed8ec275de3bb4117c5bedbf14d412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBE 5584 bytes
font_01_sfnt_off000081a6.bin
e970da32e2d6e4a0a4c541de1058ef0502995291768e5c55d70f7f8806ff06c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 14692 bytes

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