Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6867276bf69064…

MALICIOUS

PDF

42.7 KB Created: 2020-07-26 01:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d10d39f944afa02cb53ae7613c3cfb SHA-1: d4e754d7fbc7c7cd4338feaacf53759482139f5e SHA-256: 7a6867276bf69064e0b26b10c58c5044b1a986f733b5fdcafa88e08b1a2c5d37
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a school report. The presence of many links, including one pointing to a redirector, indicates an attempt to lead the user to malicious content or download further payloads.

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=four+oaks+primary+school+ofsted+report
    • http://files.bhstomp.com/uploads/1/3/1/6/131607544/b666a.pdf
    • http://files.londonderryhomeowners.com/uploads/1/3/2/8/132814241/relaxixeraxefok-ramisofesotejo-ganikegugut.pdf
    • http://files.volunteerconnectnow.org/uploads/1/3/1/3/131379578/298450.pdf
    • http://files.everywhere2everywhere.org/uploads/1/3/1/6/131636834/melik.pdf
    • http://files.derrenbackergroupbenefits.com/uploads/1/3/1/6/131607544/rakigifizonaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/jatiwozoriloz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/72404416617.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/96845955676.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/38917682634.pdf
    • https://cdn.shopify.com/s/files/1/0429/9777/6543/files/30057179777.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/fufisunoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/tibinuxolufanij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/musetoluzolezewud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/1728277294.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_off000067ad.bin
96c6cbebece9c21c286f40f6007e16c9dca2c7be14169dbd59b4fbc569f13488
pdf-font-stream PDF embedded font (sfnt) at offset 0x67AD 5292 bytes
font_01_sfnt_off000079c2.bin
6341fe1bf7a3509d17eab91980687e23b31140d21557c0c78f21adace707c8cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C2 10592 bytes