Malicious PDF — malware analysis report

Static analysis result for SHA-256 319684beb99a3c3f…

MALICIOUS

PDF

48.5 KB Created: 2020-08-12 01:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c5f42390c6a0d6757541545a05cf49 SHA-1: 7c8fd33d29521584ea8ab5bdbf669b85af32d4fe SHA-256: 319684beb99a3c3f31d816b607f2c99d8beb17b9f5acb38588742b0eb36c794d
154 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its inclusion of a link farm, with a primary URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and numerous other PDF links hosted on Shopify, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly supported the malicious verdict.

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.ru/pify?keyword=ascaris+lumbricoides+diagnostico+pdf
    • http://files.mgwelch.co.uk/uploads/1/3/2/6/132681307/rulosuxef.pdf
    • http://files.cgcpoems.shop/uploads/1/3/2/7/132740307/5461417.pdf
    • http://fitosoj.stephaniemiracledances.com/uploads/1/3/1/6/131637814/zufinavu.pdf
    • http://files.wcbk.com/uploads/1/3/0/7/130776726/4433218.pdf
    • http://files.josephfinley.com/uploads/1/3/1/0/131069887/b4f7c63d3a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72966212333.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/drawn_together_uncesored.pdf
    • https://cdn.shopify.com/s/files/1/0448/6771/5234/files/string_theory_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/77110677510.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/25659966979.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/pujemibu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/application_of_zener_diode.pdf
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/42229843006.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/dojagijamidutobofabujutel.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/werarosedixilanalanitov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/fafolaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4354/4488/files/94816032094.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/68429428883.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_off00007d09.bin
bf990ae91b107fc929cfd814e5452a3fff10a7a7e372749e6be9e762adec6959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D09 5604 bytes
font_01_sfnt_off00008fed.bin
cbf691679a143b7d3331a8a1d7c654e0ad66630db1805bf7e2246694f0d35267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FED 10208 bytes

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