Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8540768bc67e18b…

MALICIOUS

PDF

37.9 KB Created: 2020-08-06 07:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da369e8bac8c9233eb70a79281218491 SHA-1: cc0934635e514aed8aa118cd089d0719b8d65777 SHA-256: a8540768bc67e18bd28fae721a3cbc7b3b2ab49752866833a91421b9be833578
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, indicating a social engineering lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=aashto+lrfd+manual+pdf
    • http://files.sunwestsportswear.com/uploads/1/3/1/6/131637546/tanot.pdf
    • http://files.channelreligion.com/uploads/1/3/0/7/130740432/jegeg.pdf
    • http://files.nadiamatar.com/uploads/1/3/1/4/131407005/83bb236969262d8.pdf
    • http://files.stjepanpepiskuric.com/uploads/1/3/0/9/130969075/3af1e5029b9bcc.pdf
    • http://files.johnhayley.com/uploads/1/3/0/8/130874361/bf1e7c28d4ca9f5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/judegesuzopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/22402651611.pdf
    • https://cdn.shopify.com/s/files/1/0430/6246/0577/files/92701986994.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89832202682.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/old_school_runescape_magic_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/carbon_footprint_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/85705611569.pdf
    • https://cdn.shopify.com/s/files/1/0432/5110/5947/files/dotisezuwukunebi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/13826889806.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/84346699955.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3389/files/kamevavojozusip.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_off00004ab0.bin
edcfd0a0e4561d1af59e97b49af8a08ffef922c7b1285d1201a1943036fe5c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB0 4988 bytes
font_01_sfnt_off00005b6e.bin
28ff8bef38e8d48667f0d5a68a6d54f82dc78bf016ee4bacaa58351d8dea601f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 9848 bytes
font_02_sfnt_off00007cdc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDC 4324 bytes

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