Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9b468cfacce269…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 15:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda0bbf8bbdc2b8919ceb3668d2836c9 SHA-1: 3fd258ac464a1776b7bb2f76a1efa256e63e073e SHA-256: af9b468cfacce2699a091b2987f87bafa7f09671f9432dba54543a4171ae60de
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Formatting worksheets in excel 2013' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm further indicates malicious intent to distribute content through SEO poisoning tactics.

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=formatting+worksheets+in+excel+2013
    • http://juxebo.deenacormierphotography.com/uploads/1/3/1/4/131453060/8917342.pdf
    • http://files.mtef.org/uploads/1/3/1/4/131437041/6b29cc9.pdf
    • http://luwop.intensitystockwatch.com/uploads/1/3/0/8/130814297/2423179.pdf
    • http://files.swohioiscebs.org/uploads/1/3/1/4/131437806/dekazudumidox-kadejak.pdf
    • http://duronela.nicole-pellegrino.com/uploads/1/3/1/4/131437987/xipejilevezosal_kodugarutojeju_jazeveke.pdf
    • https://cdn.shopify.com/s/files/1/0451/1547/4073/files/electrocardiograma_conceptos_basicos.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/zolozepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/85530837456.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/33588057326.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/15118418803.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/13776675962.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/ranged_attack_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/69189220866.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/zubemilufuxenojerut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6554/0759/files/bixel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/zunazanuvitenejodet.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_off000061f8.bin
20d896f53647e038d77d18abc36f5c6adc73266d3ebb2114d5d7e590b1b1fbca
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F8 5880 bytes
font_01_sfnt_off000075f1.bin
2ecbe9568f8caf57ab6a4f7ed4d7c8a68b1ebb750307fb475b83f99f9a95d178
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 10164 bytes