Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1141589499bfefc…

MALICIOUS

PDF

56.9 KB Created: 2020-09-01 09:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: facd12a09161ea34bbed525d15265e44 SHA-1: e34477446f374d4595dc4c890fe70e70ba6e8898 SHA-256: d1141589499bfefcb1c7485f623120b72811b4dfbc7cd85173bc76e914f8dc8d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=cfop+pll+algorithms+pdf, which is the primary indicator of malicious intent. The presence of numerous links suggests a link farm or a phishing attempt to direct users to malicious sites.

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/wix?keyword=cfop+pll+algorithms+pdf
    • https://static.usrfiles.com/ugd/704566_9627e9ae0c2044c6ad79c26877a93b37.pdf
    • https://static.usrfiles.com/ugd/99afdc_f646f699941144f3a76a5cb6b0f0cdf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e917a9ebfc84f4cb7f12620469f7aeb.pdf
    • https://static.usrfiles.com/ugd/87a178_672cf5ec3e99402ca8aafe6ff3c24a44.pdf
    • https://static.usrfiles.com/ugd/8ba634_c3734f05e40a4102ad6b8ff654d7afaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/definicion_de_actitudes_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/gawiwewovodekujodeko.pdf
    • https://static.usrfiles.com/ugd/30e015_119777cb8d214853bf455bc23849886f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4a197002e1a48ee833a6cc440b77a39.pdf
    • https://static.usrfiles.com/ugd/105a8c_248799e857b44dc3a81f7f3ff0363f74.pdf
    • https://static.usrfiles.com/ugd/b8c837_81d893d104914a2687a9c730930d7f40.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/viwopiriguzapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/81886165612.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/89785022200.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/spherical_mirror_formula_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0429/0042/2819/files/non_stemi_guidelines_2019.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_off000089eb.bin
02365d6d15960047a9694e7f2537c0ec85e756fae82b5f66f3534a2d753d5e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 3276 bytes
font_01_sfnt_off000095a6.bin
b221e4e6b761753a75a798549097c88028ceb884a63b5153bd9dd935428d4832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A6 5360 bytes
font_02_sfnt_off0000a7b9.bin
1a09a843282a87d10336ace8e80ad8a245372e4be16ce3165a0ef32881afa092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B9 14828 bytes

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