Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b81ef72105ad5e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 00:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c7dcec419a968978745f72449456955 SHA-1: b30f4ee218527002cf07b829d46fb6a2c3e47b3c SHA-256: b1b81ef72105ad5e16f030a2ee5a79819ec5e30114f7219972abbd8fa5441ddb
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=churchgoer+crossword+answers`. This indicates a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent. The ML classifier also 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=churchgoer+crossword+answers
    • http://files.boutiquetatin.com/uploads/1/3/1/4/131438510/3392112.pdf
    • http://mumil.hungerprojectatucla.com/uploads/1/3/2/7/132712615/3266370.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/loxutiwijadewafulon.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/86188920468.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/contoh_report_text_tentang_global_warming.pdf
    • https://cdn.shopify.com/s/files/1/0428/5402/3327/files/50453472019.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/1232230838.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/bipapi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/17936947930.pdf
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/71550750840.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/series_7_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/physics_books_for_bsc.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/57099727611.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eb6.bin
14f043a16a86cff10bc9b9ee7318f37e9555b6acca7f2ab3e661a110106103ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB6 5036 bytes
font_01_sfnt_off00005fcf.bin
96a700a0eb3e7c753d3f2c33e4955bb4f840d82c2091ee1f6f5b589fe8c64ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 10332 bytes
font_02_sfnt_off0000831a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x831A 4324 bytes