Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8fb74f82eb678…

MALICIOUS

PDF

42.0 KB Created: 2020-09-01 11:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacc11b0deea69287fbd0a7a831b2583 SHA-1: 87cf1cf564a4ca8cc9da4b09577fe18223f2023c SHA-256: 8bc8fb74f82eb678bf25f0e32ae33422d9739ee7e5c33e83b58a7d5a8eecc6da
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=best+offline+bike+racing+games+for+android'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious content. 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.cc/wix?keyword=best+offline+bike+racing+games+for+android
    • https://cdn.shopify.com/s/files/1/0430/9689/9745/files/atheroma_cyst.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/60167320589.pdf
    • https://cdn.shopify.com/s/files/1/0438/9617/6795/files/ladarudaxavesev.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/vit_b12.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/catalogue_appleton.pdf
    • https://static.usrfiles.com/ugd/b8c837_82c4394a3f19487da9638d2a4cc288e7.pdf
    • https://static.usrfiles.com/ugd/dd6616_950a87c6348345539f2a6a0e8b68eca6.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4882/files/lofiwir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/it27s_always_sunny_in_philadelphia_script_submissions.pdf
    • https://cdn.shopify.com/s/files/1/0464/6938/2302/files/child_emergency_contact_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/messianic_secret_in_mark_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/76015820786.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/xenodis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/perfect_simple_plan_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0461/7820/5850/files/dukologixor.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ba.bin
e8066a35c00b8972759e005107cdb6f84f03500331f381285886b7a21dfb893c
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5592 bytes
font_01_sfnt_off000078b0.bin
9944ed67b96a796970cccd333e7d1de18aab4ecbb596f0b5a0fefac228528b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B0 10116 bytes