Malicious PDF — malware analysis report

Static analysis result for SHA-256 985da9ffad9e41ae…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 16:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef1394d5d48e6653cc8fd4e0b66d184 SHA-1: 3505aeed7116759e2f76b881ad8517bf1fabb366 SHA-256: 985da9ffad9e41ae252e65c120370ceee9960a3be4b677b2be4e77d41ce6d8be
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF link farm. One of these links, 'https://ttraff.com/pify?keyword=former+buckeyes+in+nfl', is flagged as pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other Shopify-hosted PDF links likely serves to obscure the malicious redirector among seemingly benign content.

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.com/pify?keyword=former+buckeyes+in+nfl
    • http://files.antsrus.com/uploads/1/3/1/4/131412362/dexoxov.pdf
    • http://files.winnipesaukeeplayhouse.org/uploads/1/3/2/6/132695438/379b54de437273f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/catia_v5_tutorial_for_beginners_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/fazorij.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/kaponomape.pdf
    • https://cdn.shopify.com/s/files/1/0435/4863/9391/files/air_france_concorde_crash_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/6524/3803/files/3655015761.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/keriselep.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/8571060881.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/tracey_thurman_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/wimomati.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/tafavurejuledej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/19609909997.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/liridule.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_off00006497.bin
18b943e590b28e90d04f8c1bb5d970b92d6415157a994271cc263203244728b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6497 5076 bytes
font_01_sfnt_off000075db.bin
025ce668c23267b8bbb570e5aaa0d3b0d6cf3d07c79b730425ec2f9be8cea85e
pdf-font-stream PDF embedded font (sfnt) at offset 0x75DB 10552 bytes