Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db2c4333224eea8…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 04:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1922aa4c5d508494ca08783150a19dfb SHA-1: 68dc214c24612860a0fee0400a3ba55b5d304920 SHA-256: 3db2c4333224eea8a1ff51664f8201667cab4e55eb8a700bbaeaf518298c2ef4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to lure the user to a malicious site via a deceptive link farm.

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=punctuation+in+compound+complex+sentences+pdf
    • http://files.suenospublicationsllc.com/uploads/1/3/1/4/131453684/2436685f.pdf
    • http://kejufifiw.windows8cardgames.com/uploads/1/3/1/6/131607240/9541941.pdf
    • http://files.toymayer.com/uploads/1/3/2/7/132740598/2770746.pdf
    • http://gavadu.kirstenjoan.com/uploads/1/3/1/4/131453540/5360810.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/nizifole.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/2020_desi_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/56855616130.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/least_common_multiple_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/foraminifera_bentonik.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/taloxodavepip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3363/files/pathfinder_rime_spell.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5766/files/wakidirulatilitum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokadexowigexavutezirero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006595.bin
fee71137f6c8df012962f1194dc0248331c25e9aed57feb178227b11c817c207
pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 5156 bytes
font_01_sfnt_off00007705.bin
e3ead675fd1fcd1405bef07aa5af0b8c51b06c7ad5417b8373d6636bbe41dadc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7705 9892 bytes
font_02_sfnt_off000098b8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x98B8 4324 bytes