Malicious PDF — malware analysis report

Static analysis result for SHA-256 49aeba6cebd64878…

MALICIOUS

PDF

47.9 KB Created: 2020-08-07 15:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b84d73c3c9e89923160c48a3a44117 SHA-1: c5f3aec1906d618cfb979753a54c6794ac031e09 SHA-256: 49aeba6cebd64878f3fd11c25feda194858bc5eea0c1c0a039d7830a97412674
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to domains that host PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL, https://ttraff.com/pify?keyword=introduction+to+statistical+learning+pdf+2020, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to statistical learning and the wkhtmltopdf tool, likely used to disguise the malicious intent. The ML classifier 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.com/pify?keyword=introduction+to+statistical+learning+pdf+2020
    • http://files.ndacademyofdance.com/uploads/1/3/0/7/130739475/widifirodaxuwoxuf.pdf
    • http://files.pamela-gray.com/uploads/1/3/1/1/131163777/xepev.pdf
    • http://files.gmitletterfrackresourcecentre.com/uploads/1/3/1/6/131637211/1293978.pdf
    • http://files.patriksoderstam.com/uploads/1/3/1/6/131636825/4420188.pdf
    • http://files.crowandlilac.com/uploads/1/3/1/8/131871902/6581105.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/politeness_theory_and_relational_work.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/75501658733.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/41299344685.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/35005478394.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/xirowizeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/nasotolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/51052473527.pdf
    • https://cdn.shopify.com/s/files/1/0436/2544/7587/files/discord_bot_base_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/jekuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/rikezusulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/10405458754.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_off00006d5b.bin
2db6eefc8e69bbe13a06e2e388736f19446fea2c2b58c26d3f1f951724e3de03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 5416 bytes
font_01_sfnt_off00007fd1.bin
da3cc1b81abbe33d8e99893d5b3a1a07d4c827b27218dc45c0643c63393b3161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD1 10544 bytes
font_02_sfnt_off0000a3bf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BF 4324 bytes

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