Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81013b990bef36d…

MALICIOUS

PDF

37.2 KB Created: 2020-08-08 16:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261a82807ea5a0a4a89b2bc1eae87096 SHA-1: bf4870603fd85ffdc518a6e435891c24675c55ce SHA-256: c81013b990bef36dbbc4460b492b441c9f2bbc80e9b77b87c55c3b76c221785e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'grammatica italiana per bambini stranieri pdf'. The presence of numerous embedded links, many pointing to Shopify domains, suggests a link farm or SEO poisoning technique to distribute the malicious PDF. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=grammatica%20italiana%20per%20bambini%20stranieri%20pdf
    • http://files.greatcatholicschools.org/uploads/1/3/2/6/132681488/082b8fe9a24a6.pdf
    • http://files.bdgct.com/uploads/1/3/1/3/131398252/dinajo.pdf
    • http://files.lhfministries.com/uploads/1/3/1/1/131164236/fifegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/fapikelogukopasijufomuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/38046643163.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/interview_questions_on_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/82300787991.pdf
    • https://cdn.shopify.com/s/files/1/0440/0598/2366/files/bixomigewujunanukuvebame.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/23525585563.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/jodudesatuwetob.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/38402998757.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/5735210975.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/62620239345.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/vaxubumilojusabebuxole.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/readings_in_ancient_greek_philosophy_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/simone_de_beauvoir_livros_em.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_off0000504d.bin
ef167de93671f1bd5ac8dd5b1e3a22232c6082801f942322197185221499888d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x504D 5472 bytes
font_01_sfnt_off000062ca.bin
8b54863d6237e5e5678030a513676866bebfe8f072b418a774b61266a8b9965c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 10620 bytes

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