Malicious PDF — malware analysis report

Static analysis result for SHA-256 f094f35a64e1ad3f…

MALICIOUS

PDF

67.3 KB Created: 2020-08-04 02:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe390529b94aa2406b9cbb080f1fb2b SHA-1: 4deca3aadd0e18895d9cd95d1cc7fb89f065f65d SHA-256: f094f35a64e1ad3fd1d1aa3c1ea5366b1b4ba3087fe4f24a6c1cb4b7c3a29028
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, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to 'learn french pronunciation pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=learn+french+pronunciation+pdf
    • http://files.ellisonjazzmuseum.org/uploads/1/3/0/7/130739793/nogejagesemu.pdf
    • http://files.cancerjusticenetwork.org/uploads/1/3/0/9/130969704/781862.pdf
    • http://files.hiqsgroup.com/uploads/1/3/1/3/131381003/fc85d9.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/39869795499.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/vovekowi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/gamur.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/32072053368.pdf
    • https://cdn.shopify.com/s/files/1/0437/7562/3320/files/48607467963.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5159/files/52718909368.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/wosebusitav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/sidibabujepanowem.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/44648209692.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/53219231562.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/pizza_antilopen_gang.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/bumuzewikodikowakiber.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a84a.bin
2d742028a7cd7174aa1069636ec910017ea49601db2a0a37d16b25ac6ea04987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA84A 4856 bytes
font_01_sfnt_off0000b8bf.bin
4cdb5cd7cc1660ed54f5405183b33de1b7f32c180384ade2ecc5c13a8e602340		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 10268 bytes
font_02_sfnt_off0000dbff.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16204 bytes
font_03_sfnt_off0000f12c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 4324 bytes

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