Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc644b6fc84fb45…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 03:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25cb8edf11d29bb2a0398087e3024d3a SHA-1: c08148d43dadc874f21b6697fef8185fe78874e2 SHA-256: 4dc644b6fc84fb45d0b63b1cff2d50912c698afc18b7c8c160b328e3208c3710
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=avert+trial+apixaban+pdf', which is the primary indicator of malicious intent. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted from this sample.

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=avert+trial+apixaban+pdf
    • http://nefesane.restonsusedbookshop.com/uploads/1/3/0/8/130813403/samanazufasad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/24516928385.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/37394321319.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/fezixosowin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/asvab_math_practice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/21276289531.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/velanoret.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/dumatadajewitikilovekorew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5390/8117/files/ccdp_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/jufasutorineserotagow.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/what_does_adv_stand_for.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/jumonabodagutadu.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_off00006d45.bin
1162b488d2fb3c7dcd9ea1a8ba67c77106a4ea1af4fd1f3b6cb2d93bedce1fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 5112 bytes
font_01_sfnt_off00007ec0.bin
1e89505052a797010c7c37acc2c20ece8527406ca3cdd2fc131da4e0965c8a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC0 10720 bytes