Malicious PDF — malware analysis report

Static analysis result for SHA-256 538056e84bb2339b…

MALICIOUS

PDF

60.3 KB Created: 2020-09-09 21:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f362bba0a81918642a89d2f45931fbdd SHA-1: 66cc76a2f48fadff28b70ab93d4717528bf47554 SHA-256: 538056e84bb2339bb5c861e32b248cf5c3821ae2a5d4ceaab79eedab565b2a41
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.me'. Another critical heuristic identified a large external PDF link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through deceptive links.

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.me/wix?keyword=caida+libre+ejercicios+resueltos+pdf+4+eso
    • http://jebege.mshabunal.com/uploads/1/3/2/6/132682883/f0551f7d.pdf
    • http://files.sciencesnail.com/uploads/1/3/0/8/130873833/1802504.pdf
    • http://files.coachscottschemistry.com/uploads/1/3/0/8/130873893/9e478173fe5ffaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/5372/6358/files/rutadawazekuvabosovatumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/latuju.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/rivibubebamikoxetibidug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/bidart_campos_teoria_del_estado.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/84290546683.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb6f4f93f3f483aa2a9a73aa8ca7ae9.pdf
    • https://static.usrfiles.com/ugd/70e5f7_6ab956885e274c49b1a899f2d672a975.pdf
    • https://static.usrfiles.com/ugd/565485_669a4f46794d4d109cfd32c51dfc4301.pdf
    • https://static.usrfiles.com/ugd/0a0016_598ffdc319e64ac091dc70850f02f574.pdf
    • https://static.usrfiles.com/ugd/57c819_ea94c51061e84dca9b17b50a158aa1f0.pdf
    • https://static.usrfiles.com/ugd/43d598_762156f986ec4d4995b5390cd2b5c6ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf551a7e46aa44c3a958e961fa977820.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007777.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7777 6440 bytes
font_01_sfnt_off0000876b.bin
008da4d880139af66d5bbd8d88c723b563b37b2e355da5639a048ff6ffae3a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876B 5360 bytes
font_02_sfnt_off000099a8.bin
8557e22890982bcf48a5349cdaae36a85fbaafab5416c10e97c1e14c074d71ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A8 3676 bytes
font_03_sfnt_off0000a7a2.bin
de98c682beb2f1fe202886bcb3172cb472b86ccee99f28c1174af56146bffe28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A2 10900 bytes
font_04_sfnt_off0000cb36.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 16344 bytes

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