Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f556b689d06d5ab…

MALICIOUS

PDF

33.3 KB Created: 2020-08-17 09:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 209b602e50eba6b9bd919bef2f8fea1d SHA-1: ac855b51a0b41a67627048cec293c5a0e643c23a SHA-256: 3f556b689d06d5abf1e54944c2f9696cd62cf7ca74b5f8b88698899d250c80d0
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.cc, disguised as a weather report. It also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm indicates a phishing or content-distribution attack. The ML classifier strongly flagged this PDF as malicious.

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=mussoorie+weather+report+today
    • http://files.drranvirpahwa.com/uploads/1/3/0/8/130814605/mebosidojuvorowedote.pdf
    • http://files.pelicanlearningsolutions.com/uploads/1/3/1/4/131437873/20937.pdf
    • http://sobobu.drdetailcellular.com/uploads/1/3/0/7/130738884/5875256.pdf
    • http://jatux.fccbluffcity.com/uploads/1/3/2/6/132682565/tovigiwodevax_temoloj_jeduzugila_dazujazolimuzo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/aluminium_alloys_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/aistear_learning_record_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/bilezoper.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60527157158.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/vasofigelirilotinibejiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/hey_soul_sister_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/kusowaguvuseda.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/kakerilavazenigu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8142/3262/files/49742482946.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/12408969253.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_off00004478.bin
ca49d09d138b841932aa5a6761e40e95c3fa17f6b80305703a0884d3abf5e650
pdf-font-stream PDF embedded font (sfnt) at offset 0x4478 5216 bytes
font_01_sfnt_off00005650.bin
acf152330a04956ede4c408d6e9176daa0f76e9230be381c8ebdad4be6bc4f85
pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 10044 bytes