Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373531bab2e54a2…

MALICIOUS

PDF

35.1 KB Created: 2020-08-20 09:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1358e2295dbe6f2184db6881e57764eb SHA-1: 62e90ab2639f0b6ed227dcb1adad8c59e46c6eb5 SHA-256: f373531bab2e54a2e4aa200f70e0eb0c4ea2b874225f4f6b6c73aab4d76074e9
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to various PDF documents hosted on Shopify and other domains, constituting a link farm. One of the primary links directs to a known malicious redirector at 'ttraff.cc', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'Channel islands social services forms' and the tool 'wkhtmltopdf', suggesting a lure to trick users into clicking the malicious 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.cc/pify?keyword=channel+islands+social+services+forms
    • http://saratiwi.momsforsight.org/uploads/1/3/0/8/130814310/sovuza_nazaro_mulimobive_tisezogagizemej.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/stanley_garage_door_opener_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/sisefixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/lejagodazifawijarasugikat.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/wadez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/laniruramawukebulet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/john_deere_310sg_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0219/0235/files/flow_cytometry_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/zojilo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6529/3462/files/babylonian_prayers_to_marduk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/dexik.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/guxidedufujizudizodijov.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_off000049fc.bin
7939856fb2f6b7084bc40001b0b1e606a9dd54005726f32b56f9e482b624989b
pdf-font-stream PDF embedded font (sfnt) at offset 0x49FC 5224 bytes
font_01_sfnt_off00005b94.bin
2600c48cfdcce6f830a8f179c797a52885951376eb2efd0167446163db499b21
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 10624 bytes