Malicious PDF — malware analysis report

Static analysis result for SHA-256 e616a4c9002d3b63…

MALICIOUS

PDF

47.9 KB Created: 2020-07-27 06:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72c55b89b139d8b9028f26557e17de5 SHA-1: d8e260006fa64041394aee42980cf079d66c71ea SHA-256: e616a4c9002d3b632855152bef18928ea196d2c83a7e7dc4527865ef3453de3c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a PDF link farm used for SEO poisoning or distributing malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.com, disguised as a 'f stop shutter speed cheat sheet'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be directing users to malicious websites via embedded links.

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=f+stop+shutter+speed+cheat+sheet
    • http://files.jdhsbaseball.com/uploads/1/3/0/9/130969873/c1e99.pdf
    • http://files.dilworthmusic.com/uploads/1/3/1/4/131409761/gejererarud_deramasedarizol_puwaguj.pdf
    • http://files.kaymurphyart.com/uploads/1/3/2/6/132695388/1835dfff2.pdf
    • http://files.stefanietoneygraeter.com/uploads/1/3/2/3/132303041/rovir.pdf
    • http://files.cumberlanderfamily.org/uploads/1/3/2/6/132681030/41208a255021e3e.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/mogokegadedosizudaxeparus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1829/files/22577197536.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/muxarivubafaxojew.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/nugaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/96422779193.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/18312398587.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3925/files/zafoxuvujufavulofuzavez.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/28089493686.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/85470802338.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/sudunivaduxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/pedejafepenipaxipubakar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/ribin.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_off00007f62.bin
8352ee2c54ae2eebb05125361f259fc673b0f85f902e11ad90990d963fc042f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F62 4812 bytes
font_01_sfnt_off00008fd0.bin
6beb175724bd53f4c125beb0e2f844e29dcb7396c585d99d9d03d202214f847b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD0 10008 bytes

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