Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6c4df82fc2c348…

MALICIOUS

PDF

37.4 KB Created: 2020-08-06 21:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e100f9ccd1d0b43c5c16d00bed93ad30 SHA-1: 1aed09037c13ac91e0ebfc3035106797110aa447 SHA-256: 7f6c4df82fc2c348d445cedf450c1133401563a5bdc9e663f0cee0376f315f23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=b.+p.+lathi+signal+processing+and+linear+systems+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the PDF's purpose is to lure users to this malicious site. The ML classifier also strongly indicated maliciousness.

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=b.+p.+lathi+signal+processing+and+linear+systems+pdf
    • http://files.whitneydavisliterary.com/uploads/1/3/0/8/130813714/6158397.pdf
    • http://files.newadventuresamejourney.com/uploads/1/3/1/4/131407469/ab65607f7d.pdf
    • http://files.jasonleary.com/uploads/1/3/1/8/131856158/f8c8d196f.pdf
    • http://files.modelmefamous.com/uploads/1/3/2/7/132710661/4792974.pdf
    • http://files.trinitariancongregationalchurch.org/uploads/1/3/0/8/130813378/zalazisar_watunepodemeve.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2048/files/ikea_catalog_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/56993254090.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/87905422967.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/98326180571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/bivariate_normal_distribution_conditional.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/lugokefiwivutigokujifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/avery_18660_templates.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/it_project_manager_resume.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047a8.bin
6b7608fc6b4dab0b3377f48807ce1534050269b1a69a5e86ee4b3abc238d85ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A8 5540 bytes
font_01_sfnt_off00005a4d.bin
fb9871a7c7a2668dec49469a62f484365caf42ca57abc1e3843601dc87e7e0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 9348 bytes
font_02_sfnt_off00007a44.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A44 4324 bytes

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