Malicious PDF — malware analysis report

Static analysis result for SHA-256 071344160235180b…

MALICIOUS

PDF

50.3 KB Created: 2020-08-17 07:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8e71f928fd737f9649f1a94a7bf212 SHA-1: 2badc0880c68ffece41d18689b0c4135d0643883 SHA-256: 071344160235180b2e00839017e39eaadf1039e6fde5716d1c2af2ac76775c04
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

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=endless+space+2+races+guide
    • http://lunulutal.amandanelsonart.com/uploads/1/3/1/6/131636612/7977799.pdf
    • http://lelesat.cwimconference.ca/uploads/1/3/1/0/131069839/wilutumen.pdf
    • http://files.dukecaldwell.com/uploads/1/3/0/7/130775382/7040980.pdf
    • http://nizen.dejanstojanovic.info/uploads/1/3/0/7/130739777/926b470d329110c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/bokifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/keto_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/gilopufav.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/assay_of_ammonium_chloride.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/kinux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/tadosakiwometabu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/58762727976.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/zawedoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/learners_license_questions_and_answers_south_africa.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_off000087c5.bin
81f6762b8a2836cc4d8f0d248b4bd8085985ba90d02816a743500a53442d3804
pdf-font-stream PDF embedded font (sfnt) at offset 0x87C5 5328 bytes
font_01_sfnt_off000099f1.bin
f3a1dc5191d57b9da58ba6f18a0ee8fce8f7f54ba6f70e735e72b85e59325311
pdf-font-stream PDF embedded font (sfnt) at offset 0x99F1 10212 bytes