Malicious PDF — malware analysis report

Static analysis result for SHA-256 25348d26866a5f63…

MALICIOUS

PDF

51.6 KB Created: 2020-07-25 06:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18899c7e7db33e7bd6032151eecae1f7 SHA-1: b4a975c295582dc304cc91cca775631a1c57d3c6 SHA-256: 25348d26866a5f63d10f337dc8df505de44395a7c2ec857a44dd03cdc2b24d71
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for containing links to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, likely to a phishing or malware-hosting site.

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.ru/pify?keyword=mla+formatting+website+no+author
    • http://files.azaharaong.com/uploads/1/3/1/3/131378923/dojoju-raxadimedutomaf-bilawusuxir.pdf
    • http://files.semohpalumni.org/uploads/1/3/1/8/131856394/gunabirimonebibemev.pdf
    • http://files.pennviewvisuals.org/uploads/1/3/0/7/130739076/901849.pdf
    • http://files.mikebernalmedia.com/uploads/1/3/1/4/131453894/2218119.pdf
    • http://files.mikebernalmedia.com/uploads/1/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0434/6714/5366/files/jomarerifakub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/finadevujenemeguzom.pdf
    • https://cdn.shopify.com/s/files/1/0436/8728/0790/files/vapuninelobezawilodine.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/xubevus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/68566106396.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/82604124128.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/nanemevavaxujifere.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/kudolidexivupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/semodavujeliwirin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/topudesusimubudesibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/96416106993.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_off00008ad5.bin
8194ff75908b88660417ea9811b3b2a4d377a51ee121ab061f644b8eb3c2e61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD5 5300 bytes
font_01_sfnt_off00009cc3.bin
fed0c3152daa9f796f3910a38e5c6b24827d76ee0bb4009347dce463d873f071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CC3 10616 bytes

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