Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4be1ccdd05d6938…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 04:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e346ec2c014d77e845ffbedfac8dca51 SHA-1: d286aae8e76220f05c7076becfda471a81ff58b2 SHA-256: c4be1ccdd05d693843035dc87008f7015aa0b1b29cd1a771ea9d010d8cc9b112
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0431/7977/0019/files/animal_crossing_gamecube_iso.pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the same URLs.

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=complete+the+square+into+vertex+form
    • http://files.nyacklibrary.org/uploads/1/3/1/0/131070688/mexefisidi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/animal_crossing_gamecube_iso.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/71059459421.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/importance_of_body_language_in_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0440/3914/3574/files/rch_kawasaki_disease_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0458/6428/8409/files/sumamelumamog.pdf
    • https://cdn.shopify.com/s/files/1/0434/1923/8562/files/unclaimed_property_new_jersey.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/87222297156.pdf
    • https://cdn.shopify.com/s/files/1/0431/0944/9884/files/international_business_bcom_hons_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/42648762066.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_off00006552.bin
c89e9dd5fd0e99b464b4e5e6c66b135229c1e4bb25c87d6d0bcdd7cdfb43ce05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6552 5300 bytes
font_01_sfnt_off0000773b.bin
964ceeba9e865c1dff3107047c5a0965d340ef32111eb49cd1da2d58d15acba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 13260 bytes