Malicious PDF — malware analysis report

Static analysis result for SHA-256 291b2301d0dd0652…

MALICIOUS

PDF

42.9 KB Created: 2020-08-14 19:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf2315ae40d21d976e770b531ca0892 SHA-1: 7da17cbb63c68a4b59542f8eef4890a8b078e033 SHA-256: 291b2301d0dd06527d23035d426489b29b0832a3c6570dd8a3222aa922f1e6d7
152 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 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though malformed, contains the same redirector URL. The primary attack vector appears to be social engineering via a deceptive link within the PDF.

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=general+knowledge+mcqs+test+with+answers
    • http://domala.vertimu-biurasvilniuje.eu/uploads/1/3/2/6/132681670/4a2d5d2414.pdf
    • http://files.billythebatboyscorner.com/uploads/1/3/1/8/131856725/2062570.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/16773426495.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/bibesujojezixofozosuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/51448862763.pdf
    • https://cdn.shopify.com/s/files/1/0433/8892/8150/files/dowotes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/melaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/96912297648.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/lab_eight_population_genetics_and_evolution.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/pdf_file_format_basic_structure.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/30864796983.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/vukijun.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/tosomewitogaluvetoji.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_off00006961.bin
ad9429acbb01bc646ad4ae46b96b5990fead5c0aa59c86b3cbcc1ffa94101ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6961 5668 bytes
font_01_sfnt_off00007c8e.bin
dff3c730a282190069c9a5b1ee9655e23d1ebacfa8395577656adba5a213214b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 10148 bytes