Malicious PDF — malware analysis report

Static analysis result for SHA-256 5386df6ae3412d1b…

MALICIOUS

PDF

74.5 KB Created: 2020-08-02 23:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 184ab4f35107fbc80edfb446c67fa3e0 SHA-1: 7fc85b6506fa9c262d5c147b378cce10ba448660 SHA-256: 5386df6ae3412d1b3f6fce0166041059e1daf6220fa68fa39d46ab8c498fdeaf
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering further malicious content. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and a repeated URL, suggesting it's not intended for human consumption but rather for SEO manipulation or as a lure.

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=hey+raam+hey+ram
    • http://files.musclecarsandclassiccruisers.com.au/uploads/1/3/1/8/131857756/kojakom-natajakuf.pdf
    • http://files.5ksportsandmore.com/uploads/1/3/0/8/130873944/9702836.pdf
    • http://files.danjapolitis.com/uploads/1/3/2/6/132681144/646556.pdf
    • http://files.americanrootsuk.com/uploads/1/3/2/8/132814900/5052726.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/5532292466.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/bamotaginar.pdf
    • https://cdn.shopify.com/s/files/1/0434/6799/7344/files/92089321765.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/excel_interpolate_function.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/nibowa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/zadutejemuboziwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/vexitevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6416/4506/files/53464838829.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/nodowunavagajafozugogisod.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/fukuburisovobosube.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/bojunekevukedemixegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5978/files/93027547353.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
stream_005_off0000b7a1.bin
23303fba92a8ffe0f5f49d609c63e726168543774457c09917dec18263cec0bd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB7A1 10332 bytes
font_00_sfnt_off0000a972.bin
4e1f68822a9ccc1446fdad75ebf47e87e5d2619f8ed791a785e602e796b83e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA972 4220 bytes
font_02_sfnt_off0000d42c.bin
19e0543b26c194b73eb2beb3a2d3e5865f79aad2d67a4429fecf499a1a61a31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 10708 bytes
font_03_sfnt_off0000f8ca.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16164 bytes
font_04_sfnt_off00010ddf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 4324 bytes

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