Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec4fee10509cce…

MALICIOUS

PDF

47.9 KB Created: 2020-08-12 13:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8837e12a34c44dc47e445352f61bb3ab SHA-1: 0eae67569ce0e1ad1a22472cc2c733b0842c7d7f SHA-256: 11ec4fee10509cce93102b61b5686eb0dcd6c4651774ddef0a8cdb71dbe9c424
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/wb?keyword=komiks%20tagalog%20short%20story%20with%20drawing%20pdf`. This indicates an attempt to redirect users to potentially harmful content. 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.cc/wb?keyword=komiks%20tagalog%20short%20story%20with%20drawing%20pdf
    • http://kajetun.hammanrealestate.net/uploads/1/3/0/8/130814328/ligizifobez-tefosu-piselezosavosu.pdf
    • http://files.calhounproduce.com/uploads/1/3/0/7/130775049/ec492366e37.pdf
    • http://files.ultratech-electronics.com/uploads/1/3/2/8/132814980/ginofabas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/puxirunodogurime.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/41271938074.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/skewness_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/algorithms_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/11128773297.pdf
    • https://cdn.shopify.com/s/files/1/0435/4428/1247/files/rexedetidab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/71546914953.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/farokapekukozagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/sulawovekena.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/xopalobopapipume.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0436/2246/5699/files/valeduvaponizuzimek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/lenasebib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.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_off000079e4.bin
759f41454bbfd90c7c9c3b1aab5449ab4391ab3181353ce7a88b97ae0ef77f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 5680 bytes
font_01_sfnt_off00008d26.bin
57b79f0e922394894a2c7bfac3f51251080a763e189c873c9991c04c3a1d53f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D26 11244 bytes

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