Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a65aa60bd3863ef…

MALICIOUS

PDF

38.9 KB Created: 2020-08-06 03:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0becddda58015b96be4a05c702710080 SHA-1: 1afb8e688945b8d69720ae54df56519fa1c72893 SHA-256: 9a65aa60bd3863ef4c66afb8b5a157436beba2b8b783d0c4e47b30853972e2b7
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the URL that triggered the malicious redirector heuristic, suggesting the document's primary purpose is to lure users to malicious sites.

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=atkins+molecules+pdf
    • http://files.csoaf.com/uploads/1/3/1/3/131379205/gafirobadofuso.pdf
    • http://files.marianafuentes.net/uploads/1/3/0/7/130775197/mibimulof_pasagiranan_lininowomuwezi_jafunefola.pdf
    • http://files.movingartsoftampabay.com/uploads/1/3/2/6/132682471/fokazaputunet.pdf
    • http://files.darbychristian.com/uploads/1/3/2/6/132695388/3525190.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/fifuzesogefojedekagajofed.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/46314481174.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/33714151252.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/sarotemasusavofowos.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/93282225335.pdf
    • https://cdn.shopify.com/s/files/1/0429/6900/6236/files/dev_beats_down_low.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/97947867050.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/imran_series.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/87504941269.pdf
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/attitude_and_values_in_organisational_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/icse_maths_textbook_for_class_7_pdf.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_off00005b81.bin
7fea7df143ef192638c4dd38ac5cd359b75cf279698fe4e86ffa943cc13be1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B81 5048 bytes
font_01_sfnt_off00006cae.bin
d4c2451bb1fa691c7c78d789e805f5d5aadf123ae32f4558065cc221300539ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAE 10076 bytes