Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb81824c1ccc1667…

MALICIOUS

PDF

48.4 KB Created: 2020-08-04 10:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd17125394081f2154c62a2f5939d64 SHA-1: 24eb78e6ff5a40b32a899b2e48c7da41a94a3adb SHA-256: eb81824c1ccc1667581c13778d54465e8fc9efaf978c54445980ffa1976c86d1
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external URLs. One critical heuristic identified a malicious redirector link, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector point towards an attempt to lure users to potentially harmful content.

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=aptitude+questions+with+answers+pdf
    • http://files.murdermysteriesiom.com/uploads/1/3/0/8/130814687/6193966.pdf
    • http://files.kristynwalker.com/uploads/1/3/2/6/132695472/likosejixesetela.pdf
    • http://pabilo.montessorihossegor.com/uploads/1/3/2/6/132681488/jekijelesod-lefapofevi-kavizadituset-wawoduvarol.pdf
    • http://rimonom.nightridersnh.com/uploads/1/3/0/7/130739385/zemosojopot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/navalomikiribi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/nudumenezujeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/fatojuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6503/files/ketinodasopoboxegepipoti.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/dedetal.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/lipuduzumepuzomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/xomobokatabuwurinojixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/xowufiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/wuwuvolodufew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/59553533267.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94608223162.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/chalean_extreme_schedule.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_off00006def.bin
fb0028d0fdef37b6cb31870ee4249482e070cc73b4b1586b4db00c795f336048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEF 5188 bytes
font_01_sfnt_off00007f93.bin
1f76185bf4628e48fde0ca991ab74e057dd9d0e7ad3cbe89a0b9020af8778fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F93 11544 bytes
font_02_sfnt_off0000a64f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA64F 4324 bytes

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