Malicious PDF — malware analysis report

Static analysis result for SHA-256 7073fa4bd188793d…

MALICIOUS

PDF

33.9 KB Created: 2020-08-13 07:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d539f25de9b5c1f20c1acc0ac7fad990 SHA-1: 80bf9a6da4fbf4544204349af4eeda565e91f8ff SHA-256: 7073fa4bd188793d2cb3d063d6ef899bb1b4295921a12a759d7dc089e294d880
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=brochure%20pdf%20bmw'. Another critical heuristic indicates a link farm of 28 external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=brochure%20pdf%20bmw
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://files.harmonymassagewellnessjoplin.com/uploads/1/3/1/4/131453897/bidakom_xutasi_wojidimurinulip_kakepiwexe.pdf
    • http://files.whiteeaglereiki.com/uploads/1/3/1/3/131383247/vasinazufusavovod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/tufojegixitekogidatavusaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/80343781156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/84800590736.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/ubuntu_init_d.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/xoviwuziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6557/2514/files/86973616712.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/the_anthropocene_human_impact_on_the_environment.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/badminton_history_and_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/71806940534.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/pesme_o_majci_branko_radicevic.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_off0000481f.bin
1bc64ecf922ec997672ceb9ea094e6e680b688b1835e7d8c6e311c670e12105c
pdf-font-stream PDF embedded font (sfnt) at offset 0x481F 5256 bytes
font_01_sfnt_off000059ee.bin
b6555f027157064f4f2b71e02f860b100de65112b1d40776cb0e96c4f92ff138
pdf-font-stream PDF embedded font (sfnt) at offset 0x59EE 9684 bytes