Malicious PDF — malware analysis report

Static analysis result for SHA-256 43591f503e3787e3…

MALICIOUS

PDF

50.1 KB Created: 2020-08-31 15:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f663702a6e008b4106de5d594132f61 SHA-1: 115420cc3ed8bcc7a2e41bc675caadcce69631f7 SHA-256: 43591f503e3787e3eafe4afb7a66dfe86840c94f107ae5b5a3827d30f09e9f87
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The document body is heavily obfuscated and appears to contain garbled text, but the URL for the redirector is clearly visible. The presence of numerous links to Shopify-hosted PDFs suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

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/wix?keyword=bitstream+vera+sans+font
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/capitalismo_mercantil.pdf
    • https://cdn.shopify.com/s/files/1/0464/6486/0318/files/lolotukiviwelafupezonop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3656/files/bodybuilding_workout_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6422/1077/files/40075235099.pdf
    • https://cdn.shopify.com/s/files/1/0462/9174/6977/files/jowad.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/87438277262.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/juguwov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/jokinedus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/39069036940.pdf
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/92775080485.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/22272663943.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/1738949060.pdf
    • https://cdn.shopify.com/s/files/1/0434/3988/2402/files/beasts_of_no_nation_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/7470/5815/files/alkynes_worksheet.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_off00008648.bin
26a460c8f406ef8205f3c2246c5d2677854cad90a57532f617b89c88a0d3a94b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8648 4992 bytes
font_01_sfnt_off00009734.bin
af5b80e4726db45edbc5a45e5b090901a22371bf76c8ca718758cf9b09272e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x9734 10748 bytes