Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cd375548ebc2e3…

MALICIOUS

PDF

48.5 KB Created: 2020-09-07 11:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a83be2a0ca78a7d499480d68939b4e SHA-1: 403f7572fc48f78326615e55dfa65d8954f471f5 SHA-256: 25cd375548ebc2e33c86e2073a406e3244617ef079ce78f804b5fecf78e34463
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting a link farm or redirection scheme to deliver a payload. No scripts were extracted from this sample.

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.link/wix?keyword=ap+calculus+derivatives+test+pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/mindray_bc_3200_auto_hematology_analyzer.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/nolimukazawevatemev.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/jodaximerokagozenuwudigip.pdf
    • https://static.usrfiles.com/ugd/696b8a_716f1053208f4a1fbe534c5717a87720.pdf
    • https://static.usrfiles.com/ugd/0d2908_be66f2061c8347fba5f1c27e99c7d7a8.pdf
    • https://static.usrfiles.com/ugd/07e02c_706b1538f7e24c3484bc3391c0956009.pdf
    • https://static.usrfiles.com/ugd/4b68be_3d3b0f3cdc6c4b818a35648137b1c7a0.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/vidmate_9apps_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/android_oreo_update_for_galaxy_s8.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6825/files/this_boy_s_life_tobias_wolff_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/9157784511.pdf
    • https://cdn.shopify.com/s/files/1/0457/7918/9916/files/17409022673.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/31146491086.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/caesar_3_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9504/files/gegimotegin.pdf
    • https://cdn.shopify.com/s/files/1/0470/6307/2936/files/najatanipageg.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/30426205244.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_off00006b4d.bin
8d63268e2bddcd70efcc0417a87df1ee8175916b39fc5cca92c07d6b6a480987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4D 5196 bytes
font_01_sfnt_off00007d11.bin
7ff5c8f8435d258e1c83e5a628c528a82bb0a3114f7cc11a8da6d0d5b424d83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D11 10216 bytes
font_02_sfnt_off0000a02e.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA02E 16036 bytes

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