Malicious PDF — malware analysis report

Static analysis result for SHA-256 0535e0143f66f513…

MALICIOUS

PDF

39.0 KB Created: 2020-08-06 00:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3cb542d9e3b682a465808126ee79c2d SHA-1: 8b43693c707f18b74ab46b1abf35115b69a6dbb5 SHA-256: 0535e0143f66f51335c8d3bc6971dce33b519de08595d7493af2bce1c3be222d
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=ador+fontech+welding+electrodes+catalogue+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of a catalogue. No scripts were extracted, but the presence of a malicious redirector and the link farm heuristic 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=ador+fontech+welding+electrodes+catalogue+pdf
    • http://files.kennethlam-photography.com/uploads/1/3/0/8/130814682/9151999.pdf
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdf
    • http://files.raintreeandsea.com/uploads/1/3/0/7/130739099/dinezovabufapigin.pdf
    • http://files.markdifranco.ca/uploads/1/3/0/7/130739892/e92e5d382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/9013/0584/files/multivariate_analysis_of_variance_manova.pdf
    • https://cdn.shopify.com/s/files/1/0439/0410/6651/files/79228377238.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/94583588549.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/jibek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8515/files/gurojedanivetogititib.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/mac_recovery_server_could_not_be_contacted.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/21965393139.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9109/files/partial_differential_equations_and_boundary_value_problems_with_applications.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/riguv.pdf
    • https://cdn.shopify.com/s/files/1/0440/3000/1302/files/90591466814.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24863128440.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/biwosuzazibuvawumup.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/78930247525.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_off0000497e.bin
ca7a03134ed35913d3be370b27309bbce0d40b3e7a1cc543998ca1cc27d73a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x497E 5380 bytes
font_01_sfnt_off00005bda.bin
b11782cd863fd30a1988aaa0305be1bed9f9a561360fe2127f58d0fd46ce4c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 10224 bytes
font_02_sfnt_off00007ec8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC8 4324 bytes

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