Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ab04a80d0da0fd…

MALICIOUS

PDF

73.3 KB Created: 2020-08-10 14:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a426eb246c5091aa32825dac5e62a0b SHA-1: 75b3c10b8c6bc69ac8314ed75d226087aedab82a SHA-256: 04ab04a80d0da0fdccc90839e2f4335292e9b7a736becd17ab92687c80b417fa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate traffic. One prominent URL, https://ttraff.ru/pify?keyword=adding+and+subtracting+polynomials+worksheets+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to educational worksheets and the malicious URL, suggesting a lure to a malicious site disguised as an educational resource.

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=adding+and+subtracting+polynomials+worksheets+pdf
    • http://files.lacla.us/uploads/1/3/1/4/131406701/5208991.pdf
    • http://files.raymondbonterdesigner.ca/uploads/1/3/1/3/131381363/752f4e6c44a.pdf
    • http://files.yamilkanoa.com/uploads/1/3/1/6/131636954/3898058.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/chaos_druid_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/isotropic_minerals.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3366/files/23672049650.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/kutevoxugakuluto.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/rivetogipugojesakudavikam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/5727325415.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/79109345965.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/vejomekurufawifaduj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4812/files/80023373218.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/43817405714.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/85451209248.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2507/files/86806529330.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_off0000d71d.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 2828 bytes
font_01_sfnt_off0000e118.bin
f627e152f33c780a3c8262504a83940015d943becc95a1523b3796d6870b7c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 5956 bytes
font_02_sfnt_off0000f53b.bin
7fea4454775bc964742fd2a180bf99105a4e79574b71b7ad2ccf9d0276d39b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 9932 bytes

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