Malicious PDF — malware analysis report

Static analysis result for SHA-256 a871c842ab0a7f16…

MALICIOUS

PDF

44.0 KB Created: 2020-07-29 05:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2210db0f06e48ccae328aa5ca324eccb SHA-1: df82cd675e2803d1b26d77cffb4b8809569e2f39 SHA-256: a871c842ab0a7f1699e808555c2b20baa994b4a5c109524518915b1e94841b72
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', and another for a PDF link farm hosted on Shopify. The document body, though heavily obfuscated, suggests a lure related to educational content ('Compare and order 3 digit numbers worksheet'). The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded 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.ru/wb?keyword=compare%20and%20order%203%20digit%20numbers%20worksheet
    • http://files.myfutra.com/uploads/1/3/1/3/131384018/netax.pdf
    • http://files.mixmax.biz/uploads/1/3/2/7/132740482/gupixakesafoked.pdf
    • http://files.spookyhousepress.com/uploads/1/3/0/7/130775063/fd97123f5.pdf
    • http://files.freereformedchurchlangley.org/uploads/1/3/0/9/130969573/rigopurexuda.pdf
    • http://files.legacyhorselogging.com/uploads/1/3/1/6/131636990/rakofidi-tuxujojaxeki.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9335/files/tonukiduwuposokidojilev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/kutixosiziferuzetenizamup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/24548567103.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/15497673024.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/pidutepederipixodibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/42894836241.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/zuretad.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/mixorasorom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45287622464.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/9206742353.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/pusifawifiwipugega.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/18475987626.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_off00006cc5.bin
6c9bc28612ddc484dc5251d11da03129797a33d254bd646cf68eb5f42dbc2f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC5 5704 bytes
font_01_sfnt_off0000800a.bin
b8a25661e23cb8568b11ddc8546e97827ef89188cd19c630038e6af06eea3ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 10040 bytes

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