Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39441423b5fb8b5…

MALICIOUS

PDF

61.9 KB Created: 2020-08-10 17:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74895549cb439248b12454b134d46fc SHA-1: 0334c95d60452bce3017647b073e488035122795 SHA-256: b39441423b5fb8b5d0c2f408d76b8bb8aa403972358e8e3903a19e8328566c48
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a link farm heuristic further indicates a malicious intent to distribute links. No scripts were extracted, but the overall structure and link analysis strongly suggest a phishing or malware delivery attempt.

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=handbook+of+the+cerebellum+and+cerebellar+disorders+pdf
    • http://files.actionpooltour.com/uploads/1/3/0/8/130874520/4203753.pdf
    • http://bibeben.mrwegnerinroom92.com/uploads/1/3/0/9/130969656/meragubero_bodejinemorire.pdf
    • http://files.cpang-architects.com/uploads/1/3/0/9/130968926/sirakolul-ximova-buguselo-mubapawabebej.pdf
    • http://sazujum.juliehui.co/uploads/1/3/2/3/132302780/2914e481134cd0c.pdf
    • https://cdn.shopify.com/s/files/1/0431/1210/4103/files/buzanikofepop.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/88158971559.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/52254657241.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/58610197094.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3073/files/mr_coffee_keurig_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/3916766931.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/nuvolebana.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/logutoxisotimadula.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/statistical_treatment_data.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/kixeletifisulalawipagep.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_off0000a769.bin
cc4527868670b692463e0b1be7f2d5aa67ab43d13f8612cd4289019611318923
pdf-font-stream PDF embedded font (sfnt) at offset 0xA769 5560 bytes
font_01_sfnt_off0000ba1e.bin
9e18723a827ade3a1cd0438c949f3749d032ded487a35893bfca4967d1be4ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1E 15720 bytes