Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ad453ef40101fd…

MALICIOUS

PDF

40.5 KB Created: 2020-08-11 01:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e836727b764d4a4c13bb710596f556a6 SHA-1: 3c21d61e69c91024b858af23703f0573bcf99727 SHA-256: c4ad453ef40101fda164ab4cc7602c082768db4fde7b325ebb3d5cc54e862fb6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=grammar+english+language+teachers+pdf'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm strongly suggest a phishing or malware distribution attempt.

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=grammar+english+language+teachers+pdf
    • http://files.afchoir.org/uploads/1/3/1/0/131069869/xaxebababot_zukejomovujub_jazuz_jibonef.pdf
    • http://mewel.booneiowasoca.manriquez.net/uploads/1/3/0/9/130969744/zowebazopif.pdf
    • http://files.unconditionallovefoundation.org/uploads/1/3/1/3/131379820/4704392.pdf
    • http://files.fiddleheadcellars.com/uploads/1/3/1/1/131163617/fekej-gebowesodus-moxiromegolu.pdf
    • http://files.letschangeourcity.org/uploads/1/3/1/4/131406086/0cb283.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/sexanik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/dunepidigezagipos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/bruchrechnen_aufgaben.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/annuity_practice_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/geometric_figures.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/fumebaxalibalarejum.pdf
    • https://cdn.shopify.com/s/files/1/0440/0958/6846/files/44815058946.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/sumumuwekolef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/pivubekezejebifewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/warhammer_40k_khorne_daemonkin_codex.pdf
    • https://cdn.shopify.com/s/files/1/0447/4427/8170/files/jee_maths_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/9139/8561/files/chipotle_cado_crusher.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/lebujikajugasabuni.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_off00005e33.bin
43c1517b06484be1422eea06b080ac882f1a90ba6f21cdc9aa758fbcff619ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E33 5600 bytes
font_01_sfnt_off00007113.bin
280bce379ebf847af5f4ddb8fd64b1e8a05d3c735a42cb6553edab27c698acd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 10544 bytes

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