Malicious PDF — malware analysis report

Static analysis result for SHA-256 154d98fdcc13f982…

MALICIOUS

PDF

41.4 KB Created: 2020-08-14 00:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e265c494f6abbe32663f0cfade87fe SHA-1: e14e8fb3d7bb3b3c2bcf7dd4e9a551b95efcbb94 SHA-256: 154d98fdcc13f98225d530d0e8861f50ecc3041eecd82792de2ec4e366fe66c9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'whatsapp video call recording'. The document body also contains this URL and numerous other links, suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=whatsapp+video+call+recording
    • http://files.northbaytheatrics.com/uploads/1/3/1/4/131483719/vafikodesige.pdf
    • http://files.coffeesonme.com/uploads/1/3/1/4/131482941/nitizewerutefiz_fomiz.pdf
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/fozixowati.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/lulabiwififiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/51449874748.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/porenutu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/37897992908.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/arbor_buzzard_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/jesubofupasivonamego.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/cpa_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/sezupozaxanubuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/75692906268.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/causes_of_anxiety_disorders.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_off00006485.bin
80167e12e529de89c770d7a4e0c74841810f3ffd7bd0415526466499a4dd0ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6485 5408 bytes
font_01_sfnt_off000076f9.bin
08b3a7a748aa8c1e51c4244e579e994ee4a8a6e47d2d39223cc759202adcd083
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F9 9856 bytes