Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae90827c5963d533…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 12:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27185d16557563bf7bcda3a19537b72c SHA-1: 48708a96e573be13a9981debe160e50b5b4a6ef2 SHA-256: ae90827c5963d533386d81f912c22ad3c22450cf13fd3c0298be7b82a2696210
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to shopify.com domains and a redirector URL. The primary malicious URL identified is https://ttraff.cc/pify?keyword=barre+class+template, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URLs, suggesting an attempt to drive traffic to these malicious sites. 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/pify?keyword=barre+class+template
    • http://files.educooperative.org/uploads/1/3/2/7/132740525/3fd649.pdf
    • http://files.fwsomusicians.org/uploads/1/3/0/7/130739210/e37361c4d963.pdf
    • http://files.kristiepottertherapy.com/uploads/1/3/2/8/132814972/6754e8cd8481f3d.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/14901544918.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/eso_forgotten_crypts.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/73310617751.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/39939932686.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/mudugivitidopigerag.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/moluvipunekajaxejizuwepa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4030/7362/files/54073108318.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/43763658685.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/electrician_apprentice_resume.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/basic_trial_advocacy_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/2003_buick_century_repair_manual.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_off0000654f.bin
208438c3e0fb8129ea249b6a15a954bc25303e8d5a317b1a4008c93acdc5a586
pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 5128 bytes
font_01_sfnt_off000076a5.bin
50befe4a4c356b3a7c14d0e9bd66d1a47807cf9a362114a141ef0588e2e68d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 10088 bytes