Malicious PDF — malware analysis report

Static analysis result for SHA-256 90afa4ecab0e182a…

MALICIOUS

PDF

61.5 KB Created: 2020-08-31 17:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 378598ee43e390ffedaf8e7a4f7a81f4 SHA-1: 14a2a48d55aee2e170287cd15ea49b2e45c1ae6e SHA-256: 90afa4ecab0e182aa2f415eae1272eb7c75501d6e410d195a171659782fc002d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL https://ttraff.cc/wix?keyword=friends+album+song+in+tamil, which is a known malicious redirector. The document body contains this URL and other benign-looking URLs, but the heuristic firings are the strongest indicators of malicious intent.

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/wix?keyword=friends+album+song+in+tamil
    • https://static.usrfiles.com/ugd/b8c837_9317eb29db70495d88f1b505263542c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b30317aaa5564d66978070745cb83036.pdf
    • https://static.usrfiles.com/ugd/73c254_84367f0c30f1470184127e53db573dac.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/what_happens_at_an_engagement_party.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1477/files/zogijidojubadilokobo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/bolujirojafofifazakal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_b1308e8efc5f48c0af58e9de594c1f17.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce41e1d292b3472a95063fe4dec07992.pdf
    • https://static.usrfiles.com/ugd/16a96a_a56b21037dc74337a62e35df950f9c4d.pdf
    • https://static.usrfiles.com/ugd/0047a4_62542af9137b4e82b2cb3a992a2cc48d.pdf
    • https://static.usrfiles.com/ugd/b8c837_de4b68173cf7430ba8f07f3740fed396.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_2030007dcb814d9bb56d3b2ec20d8a19.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_15575acbfb31477f9484f5a40594c442.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_off000067a5.bin
9866bc6740bd11175eff7c93ea72c8fd44c78d989d0d7c67c72ab7834549ebce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5240 bytes
font_01_sfnt_off0000795a.bin
fdd606f992db2313bbfedd825483fc33da1f7456185351f5f2d630c556f9117b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795A 16496 bytes
font_02_sfnt_off00009f57.bin
28336a0cb3f8e641e75945af3d35324194abd932e21d2bc38800f63db353b10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F57 2044 bytes
font_03_sfnt_off0000a8c2.bin
92e83d81cd517216f3e96cf6243f4a8e422becbbdfc4999200bd59ec50f7c3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C2 12864 bytes
font_04_sfnt_off0000d16a.bin
bfd0e6c6940e8a73eb197773a0373651b93fcb42ccb32e89cd1a7c5c386ef8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 16548 bytes

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