Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d21a3981dbd03b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-22 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a8bc0c80f49251c29d4c857ec0956f SHA-1: 27911e9dafd3c48a65caea0de814972a4d49e58f SHA-256: c1d21a3981dbd03b3ac40eeb7b16d94dca35d3120610eecadbbb8126957abedc
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs, with the primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. This indicates a likely attempt to drive traffic to malicious infrastructure, potentially for further exploitation or phishing.

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=ayyappa+ringtones++free
    • http://files.arenalrainforestproperties.com/uploads/1/3/0/7/130739493/5661929.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1821/files/miwowodupabimikitanupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/91648443110.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/bwssb_application_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9794/files/ayushman_bharat_hospital_list_in_up.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/86337337801.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6235/files/sotoratofud.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5514/files/27748016885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0433/4567/4389/files/80697206622.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/xosigifivet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/array_of_objects_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/wakafaxixofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1303/files/12674471073.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_off00004a88.bin
ae2df0fae0aa6c441a5316112b70d4b9012b6180da7d67d1cec63c4af9006b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A88 5128 bytes
font_01_sfnt_off00005c0f.bin
3b0cb8088933945cee82afcf25fe14d380589d028891c354207c2f815bdbedf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0F 13092 bytes