Malicious PDF — malware analysis report

Static analysis result for SHA-256 14efd2f398f4a7bd…

MALICIOUS

PDF

42.6 KB Created: 2020-09-11 11:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dbea782aa52ca28192cdbfdc1570f61 SHA-1: 32ac12c9b296df94bac3221c0f0345267dbe92db SHA-256: 14efd2f398f4a7bda8bb0f232f50649f591b79c2a7d3704b48f6ff5e49ecb681
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for 'chromecast app android free', which redirects to a malicious URL. This indicates a phishing or scam attempt, likely using the document as an attachment in a spearphishing campaign. 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.link/wix?keyword=chromecast+app+android+free
    • http://febejoreg.thegatheringgarden.com/uploads/1/3/1/3/131384081/3608817.pdf
    • http://files.theleominstercanal.co.uk/uploads/1/3/1/1/131164399/repofez.pdf
    • http://files.gntc1.com/uploads/1/3/2/6/132681504/pesevavirusex.pdf
    • http://files.317-447-4377.com/uploads/1/3/0/7/130776149/tupavaxidirabosuda.pdf
    • http://xavepu.shantyshackbrewing.com/uploads/1/3/0/8/130814124/tivogawuwog.pdf
    • http://files.morganofriverton.com/uploads/1/3/1/4/131453695/xaliwumibedun.pdf
    • http://files.jurassicriders.com/uploads/1/3/1/3/131383283/0535bd1d076b.pdf
    • http://dadamikas.karmenkooyers.com/uploads/1/3/1/1/131164250/654785.pdf
    • http://files.amhcsexualassaultservices.org/uploads/1/3/1/8/131871864/sinatuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ae15ca_7251d00497af4313b8acd74cb25d53d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_36fb915e0096447898b6b4d3571db319.pdf
    • https://static.usrfiles.com/ugd/c8f33b_03e8212cdd364e1f9e4876f8231d6f36.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/59811594108.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/cbse_class_11_chemistry_textbook_download.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_off00006815.bin
683a906743029b19d27e845835b34aa9d560f3d14df8a324301b937070536fda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6815 5268 bytes
font_01_sfnt_off000079ce.bin
36428bec4b950cdf67d7a13d41444745a5e5bee9475a1dedce308887fc660967
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CE 10364 bytes