Malicious PDF — malware analysis report

Static analysis result for SHA-256 58be09cd03968f57…

MALICIOUS

PDF

33.4 KB Created: 2020-08-21 23:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36de08a4c3c89e796d50bbfa31de52bf SHA-1: a4fd69c8d650f4dc5632c41810c2fe7d45c3d47f SHA-256: 58be09cd03968f57a804e0b83185fb6443dc417457e8cc292d5a47440578fdf5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at `https://ttraff.ru/pify?keyword=kshatriya+telugu+movie+free`. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=kshatriya+telugu+movie+free
    • http://files.getanswersmath.com/uploads/1/3/1/8/131856545/e90093.pdf
    • http://files.columbiacountymhc.com/uploads/1/3/0/7/130739789/vamona.pdf
    • http://files.sjsldetroit.org/uploads/1/3/0/9/130968962/9888874.pdf
    • http://fisasuki.grandparklive.com/uploads/1/3/0/7/130775951/2abb115d819.pdf
    • http://files.five4him.com/uploads/1/3/2/7/132740435/8763100.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/10547486861.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3728/files/xunamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/66044353887.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/vegexerebupuvasitolo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/18043060089.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/barium_sulphate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0434/6419/6256/files/bipewede.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/past_simple_regular_verbs_worksheets_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/affidavit_of_heirship_form.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004548.bin
d43962a860550ef4238b05ab05c4265542674ea4de5676e2455c385a806a41c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4548 5312 bytes
font_01_sfnt_off00005748.bin
1df164b266fdc721e9d5e8f479029f15183c1cf10d6d6ba8a33b536fa33d5a44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5748 9896 bytes