Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1726efb58fb312…

MALICIOUS

PDF

55.9 KB Created: 2020-08-31 06:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d043b4787af211d6d1567861d2674766 SHA-1: f000079bf58b6e15760ee6fb801c433464ecc0a7 SHA-256: fc1726efb58fb312bf3fda75ae4c44425de48cf32c44a5017f9eeae40e5b5087
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 hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains the URL for the redirector and the first URL from the link farm.

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/wix?keyword=annex+command+hoi4
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/minotulatetadef.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/7974602186.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/pixoleruse.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/zavuruxilefaxel.pdf
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/panababewujopetozipil.pdf
    • https://static.usrfiles.com/ugd/b8c837_172d42e92ff247ad86fd322153d4e154.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d454b30adc47edb1a065119f5ce234.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba81411a5788433eb5a317c500da141c.pdf
    • https://static.usrfiles.com/ugd/67f5f7_6c80e2956b3e45258187bcc1c82cda72.pdf
    • https://static.usrfiles.com/ugd/b8c837_baf03b0f78af4595a2ef86900b87d4ac.pdf
    • https://cdn.shopify.com/s/files/1/0465/0257/6286/files/41977834570.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/12582610794.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/vatabaxije.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/lamajomukawojami.pdf
    • https://cdn.shopify.com/s/files/1/0441/0825/1288/files/52636564637.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/39466407396.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/eulogy_template_for_sister.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/estadistica_descriptiva_concepto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086d4.bin
16a91ca7a04145014e721db96cfa49b13eadbc218656cac8a62af70929334e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D4 4728 bytes
font_01_sfnt_off000096a7.bin
c3f9c4a1fd161b931d9b5178a487ac539b04e8eda9bd1f8264b061bb3051f583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A7 14596 bytes
font_02_sfnt_off0000c4a7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 4324 bytes

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