Malicious PDF — malware analysis report

Static analysis result for SHA-256 3254117174ec3e4a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-04 15:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317591c1c9d52eae5bdf3954693423ee SHA-1: e910e9ac8d937c5cf62969f4a283c095a38f3a86 SHA-256: 3254117174ec3e4a055d019064311ed8019f81d60900418dab51118e044c03fc
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. This indicates the document's primary purpose is to redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and heuristics clearly point to a redirection-based attack.

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=a+monster+calls+pdf+patrick+ness
    • http://beget.fremannfoods.com/uploads/1/3/1/8/131856161/wabarala_xonekabe.pdf
    • http://files.officesatlibertycenter.com/uploads/1/3/0/8/130874526/girinib-fenodubosib-kaxavotusawa-xixajituneraf.pdf
    • http://sitad.vncstaffing.com/uploads/1/3/2/6/132681342/wukiwaxewa.pdf
    • http://files.luciademarcoillustrazioni.com/uploads/1/3/0/7/130775309/jubakizonivumusonut.pdf
    • http://files.mymountains.fr/uploads/1/3/1/6/131606953/tasafaxejojoxum.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/94652463019.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/71741757271.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8685957786.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/mimemufax.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/98134150017.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/11416151926.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/81430727101.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/rivuzepelivasitini.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/boise_tv_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/136221467.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/the_catechism_explained_spirago.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_off00007938.bin
67becd27cf15d0c74c80ab154588f26aac03978dd4cc51cd7c9ff6233f835f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x7938 5356 bytes
font_01_sfnt_off00008b56.bin
9ea8618f9df5550187d2c4579395569e923bd24ff32668e56fa135a08309f1e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B56 10144 bytes