Malicious PDF — malware analysis report

Static analysis result for SHA-256 3252fda61130a85c…

MALICIOUS

PDF

36.6 KB Created: 2020-08-24 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 032771f9de011580fe52bd9dda96c700 SHA-1: 3980e72572edb11fccd2dfb8a1f4835c4d42f8ea SHA-256: 3252fda61130a85c6b2c8abcd0c136b9bf259e505dd7c0101f98e88012ad4d84
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=peanut+calorimetry+lab+answers`. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on `cdn.shopify.com`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking PDF links, likely intended to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=peanut+calorimetry+lab+answers
    • http://gakivura.cocopahfarms.com/uploads/1/3/1/8/131856072/tilogedodi_sunuxowunod_zibidub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3205/9810/files/68800365162.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/archidoxes_magicae.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1177/files/the_ketogenic_mediterranean_diet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/82338865927.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/63128234973.pdf
    • https://cdn.shopify.com/s/files/1/0464/8425/8984/files/b_arch_sample_papers_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/51563675842.pdf
    • https://cdn.shopify.com/s/files/1/0440/2770/7557/files/ms_excel_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7198/7098/files/776949921.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/pefupoxamunanadiwaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2083/6254/files/najaduzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/arena_of_evolution_chess_heroes_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/84025710251.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/65874104933.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005186.bin
8a7c723f907e66f94226aed2a26a8fcb5766526adeb9b81d00453a14f816062c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5186 5280 bytes
font_01_sfnt_off00006374.bin
50c80117e6f6e7d6e689d2eb996c656bf9d7c78c36fcfd6f0847e87e408bf694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6374 10008 bytes

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