Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a4728a52e79fb…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 18:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26f0a2ae35856277c1df123f31af5070 SHA-1: e71b0123f793d77b8dfc1afcd49c128fc4f07381 SHA-256: 829a4728a52e79fb29f328ac000d701a8fa51759cc254fac7ca256b076fcc52e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a technical specification, likely a lure. The presence of many external links, including benign ones, suggests a link farm or SEO spam tactic, with the primary malicious link being the highest priority IOC.

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=dell+r710+specs+pdf
    • http://files.kevinzollman.com/uploads/1/3/1/1/131164425/kalesilixezeful.pdf
    • http://files.hazelminerbook.com/uploads/1/3/1/4/131437669/c9a73350d973.pdf
    • http://rekewan.beautifulnapatours.com/uploads/1/3/1/4/131406436/sesug_ziriz_xegonube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/pdf_text_size_editor_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/83926541109.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/addition_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/96699486735.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/breaking_benjamin_we_are_not_alone_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2181/files/rejavivebami.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0441/2915/7272/files/academic_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/89224214261.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/50933962407.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2661/files/makalah_tentang_filariasis.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_off000058ee.bin
b2fa4ca280034a424928e3d5157bf2abc2ddc12f9bbdc834f83ee30f4d2270da
pdf-font-stream PDF embedded font (sfnt) at offset 0x58EE 5212 bytes
font_01_sfnt_off00006ac6.bin
28b3e6a0d16be324888b9cb6d727ba9b13e48ffe4d3719ac2cb3a5f5882a20c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 15776 bytes