Malicious PDF — malware analysis report

Static analysis result for SHA-256 3562c72a313db3ef…

MALICIOUS

PDF

82.6 KB Created: 2020-08-04 14:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3269fb4ab898f00b60bd39f674e717aa SHA-1: 7bb7ec89ff7fc6a605585ade870ff31aced2d127 SHA-256: 3562c72a313db3ef2f05a8eb5d4f32d2c84419bdaf9105a5a07f1b4e41ff9153
152 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 for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.cc/pify?keyword=east+african+history+notes+pdf'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with 'https://cdn.shopify.com/s/files/1/0429/6055/2085/files/57757291094.pdf' being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a lure to download or view content hosted on potentially compromised or 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.cc/pify?keyword=east+african+history+notes+pdf
    • http://files.myslotweb.com/uploads/1/3/1/4/131437725/dizudabokulu.pdf
    • http://files.michellebergermd.com/uploads/1/3/0/9/130969942/rikudufusugir.pdf
    • http://files.sangresbestbeef.com/uploads/1/3/1/4/131437987/zuwefatag.pdf
    • http://files.redwingfarm.net/uploads/1/3/1/6/131637273/b60dea50d597c8d.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/57757291094.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/30976338067.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/18093545949.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/74424721224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6600/7445/files/vipug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/67542003314.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/2665771619.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/nobubekogegoden.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/zatovojojanekazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/97985781551.pdf
    • https://cdn.shopify.com/s/files/1/0437/9567/7346/files/nba2k13_free_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0439/7993/1806/files/free_john_deere_425_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/juvapes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/35385206553.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin
65d4d02d3521338d5dbb870833640eeea06574ef8ad6a2d4a81580a68bc37917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 4616 bytes
font_01_sfnt_off0000ef44.bin
1aad3b74386f282796a6f80f5350fd014ea386df858182b5e4b45ab13e6d94d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 5268 bytes
font_02_sfnt_off0001013b.bin
b5efcdae049d68599c0acaed829297aa6c97daca3f5b90e269cd66f4f8345b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 11268 bytes
font_03_sfnt_off00012709.bin
43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 16148 bytes

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