Malicious PDF — malware analysis report

Static analysis result for SHA-256 084edf632ddefb76…

MALICIOUS

PDF

81.2 KB Created: 2020-08-26 02:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2acb4d1e0a224ef04f16d1439f8d01dc SHA-1: 250542c10e578b36ce393933aa3e996b29e49c24 SHA-256: 084edf632ddefb76c00b23f9d189b572a4e996c2081fb6592973a7f5288997a8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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.com/pify?keyword=autores+que+hablen+de+la+educacion+f
    • http://xaluz.razajamiamasjid.org/uploads/1/3/1/4/131438428/sagaxo.pdf
    • http://files.ltlfitness.net/uploads/1/3/2/6/132680869/bumor-pufogomujeg-bozov-mosuzemisatu.pdf
    • http://files.thenutritionhutt.club/uploads/1/3/0/7/130739783/b4cc77fee8de86d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/889081386.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22945880436.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/bisoxiselokagofose.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7263/files/xulotisez.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/foburakezakamivoretagug.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/ccrt_scholarship_application_form_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/signalr_sql_backplane_performance.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/factorio_pipe_throughput.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15c.bin
74983d81ebcf059b09a802774a8816146146042c092a47eb98db3912458d88ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 5244 bytes
font_01_sfnt_off00010325.bin
87c81ff6f143300cc8117045c89c530ffd58efc95d6ec088bbc57056846ab2a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 11300 bytes
font_02_sfnt_off000127e2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 4324 bytes