Malicious PDF — malware analysis report

Static analysis result for SHA-256 6477bb51e6bfd182…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 20:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18f24d8b684e96fd14f5fcf58b777d7f SHA-1: 3fe45c3c7794ca86d3bf3abe2b20fbb70019f2cf SHA-256: 6477bb51e6bfd182e1b0a8d221682e22d08a0eb882a54d07995ce81ed8540eb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself is heavily obfuscated and contains the primary malicious URL, suggesting an attempt to disguise the malicious intent. The ML classifier strongly indicates maliciousness, supporting the conclusion that this is a link-farming or redirection attack.

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=afternotes+on+numerical+analysis+pdf
    • http://files.gaythessaloniki.com/uploads/1/3/0/7/130776589/jaxizoketeru.pdf
    • http://files.stagecouprecords.com/uploads/1/3/2/8/132814972/soxevopuworisosipofi.pdf
    • http://tefokejer.permitsfl.com/uploads/1/3/1/4/131438641/6423695.pdf
    • http://files.upinsmokepottery.com/uploads/1/3/0/7/130775025/400f729d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29025511016.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8447/files/66239999725.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/polomozexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/76562705505.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/19751822860.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/kisuselif.pdf
    • https://cdn.shopify.com/s/files/1/0434/6576/9110/files/vorekozuwirujiwaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/86676216202.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/33271040254.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/pojuropanebapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/najusejibidovirebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3138/6529/files/anna_karenina_novel_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a0.bin
fa71b02f14f8cc59c33a299cee5318691ade84c273b89f8541b09d5bda6d8231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A0 5392 bytes
font_01_sfnt_off000074ed.bin
8521fe09cf1d15bda06e6d57c0096e388c40038ed5f0c17d5cbcc291050947a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74ED 10316 bytes

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