Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85f85df39ad6ef4…

MALICIOUS

PDF

47.0 KB Created: 2020-07-19 19:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf43a8178eecccb0d167ff484b2cfa3 SHA-1: 5166ae7a20796a5e5366668099b8558e086ba90c SHA-256: c85f85df39ad6ef4aa0f3f7deea503bfda67492f15963a06d6465d7a01f76c7c
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm behavior, with numerous links pointing to external PDF files, 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 distribution 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.cc/pify?keyword=android+studio+3.3+kotlin+version
    • http://files.rumidesigners.com/uploads/1/3/2/6/132681910/c8c4f72ace7cf.pdf
    • http://files.artsforart.org/uploads/1/3/1/4/131453633/rakorexobipun.pdf
    • http://files.insportsfoundation.org/uploads/1/3/1/3/131379037/padoburiginofami.pdf
    • http://files.mollyberesforddesign.com/uploads/1/3/0/8/130874559/6197ce5a4c.pdf
    • http://files.artsforart.org/uploads/1/3/1/4
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/ledotuziwizanapal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/supuzodufera.pdf
    • https://ximufilukub.files.wordpress.com/2020/07/raxukal.pdf
    • https://xugitonatuv.files.wordpress.com/2020/07/riposejemofoloxiviwoxojiv.pdf
    • https://jojoveda.files.wordpress.com/2020/07/51984169821.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/54311687561.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/liranumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/voxetojetazabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/sepajutazasiromesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/jajute.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/wupudires.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/toraladomokipina.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_off00007bba.bin
30dd470fdddedeaef5b87920ec6494e53901aaa8cfbbec6957ba55687799d40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBA 4800 bytes
font_01_sfnt_off00008c1f.bin
87d6560ca540351e03720df93db47422c16fc4a2a11254c2a1f7b8c685d1205b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1F 9976 bytes

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