Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f48fb9c8c2c013d…

MALICIOUS

PDF

42.9 KB Created: 2020-08-08 22:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7239d542476411c02066b03842cf43c SHA-1: 205544cfbb88cb5b3b747e28b9e665a10b5edb9e SHA-256: 0f48fb9c8c2c013d767c736e11afc678c8bc4484e074b3f1edd2dfae29cfeb76
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.com/pify?keyword=anthropology+books+for+ias+pdf, is identified as a malicious redirector. The document body contains obfuscated text and URLs, further supporting a malicious intent. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate a likely attempt to lure users to malicious content.

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/pify?keyword=anthropology+books+for+ias+pdf
    • http://files.bullbearkidsbooks.com/uploads/1/3/2/6/132681404/medewesiposade.pdf
    • http://files.ncwknittersguild.com/uploads/1/3/1/4/131453213/326d04a2c.pdf
    • http://files.mallencunningham.com/uploads/1/3/1/1/131164124/4a24b61272b.pdf
    • http://luvufubi.islandchamber.com/uploads/1/3/0/7/130776542/101a4fd6bcdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/rubric_assessment_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7093/files/noraz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/noviri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/kibalexisazadonabit.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/29140563341.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/desevuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/roxuluzorugevepuwugiwoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/2716897249.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/34408433859.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/71525445882.pdf
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/tejipebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3729/3724/files/fenewafurol.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_off0000691a.bin
9a966f43d28ea7ad9f46302956edd743e11efa0299792472328975e27740ed62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691A 5600 bytes
font_01_sfnt_off00007c28.bin
acebfdf98d653246f6005fbf067def727ff0b85fd128b870c24b4182d9c71f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C28 9920 bytes

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