Malicious PDF — malware analysis report

Static analysis result for SHA-256 1160cbdbad368c6e…

MALICIOUS

PDF

49.0 KB Created: 2020-08-13 02:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d04f5a7982aa3d722cc66e4cc6c18e48 SHA-1: 4f667b7cf1469eb52ba4ce3bf8e459a88b5a5cc7 SHA-256: 1160cbdbad368c6e86d541003422bd605b5a63cbc56abd6c2f697fc1fde12a0b
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one heuristic specifically identifying it as a link farm. The primary malicious URL, 'https://ttraff.ru/wb?keyword=b%20prus%20lalka%20pdf', is flagged as a malicious redirector. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to either distribute further malicious content or engage in SEO manipulation. The ML classifier strongly indicates 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.ru/wb?keyword=b%20prus%20lalka%20pdf
    • http://files.oswegoeastmusic.org/uploads/1/3/0/9/130970003/mitadexamofubut_dabisewavotozis_rivowopi.pdf
    • http://files.greentreeassociation.com/uploads/1/3/1/8/131871477/kipudulazover.pdf
    • http://files.hionfi.com/uploads/1/3/1/0/131071063/kezatile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/learn_spanish_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/voltaire_candide_ou_l_optimisme.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/libuzupowofaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/vitamin_b12_deficiency_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/seismic_waves_activity_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/xewarisewixugisulegaxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/zizezoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/oh_you_re_approaching_me_copypasta.pdf
    • https://cdn.shopify.com/s/files/1/0435/6096/0159/files/best_tablet_for_storing_and_readings.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/54963014397.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/restaurant_organizational_chart.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_off00007f68.bin
e1e403cd3c733ac018b7ed9e8a9b484e6d055b8140ffdc0297dd45f5f5c6eb1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F68 5148 bytes
font_01_sfnt_off000090fd.bin
8fc16c2029c73f4ec995ef2ac80e32a232f36b11b561aacecd09fb52bc3f3b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x90FD 11932 bytes