Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d58439dce13dd5d…

MALICIOUS

PDF

38.5 KB Created: 2020-08-10 08:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ee5fb39a68febda217f469552572b9 SHA-1: b83af9e562a847c9f9928d2ddfbccaafdafa0f00 SHA-256: 8d58439dce13dd5dfaa1d461ef54d60dda7679a9aab5039d5b6b0cfead98d6b7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=someone+noone+anyone+exercises+pdf', which is flagged as malicious. Additionally, a large number of links to Shopify-hosted PDFs were found, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=someone+noone+anyone+exercises+pdf
    • http://files.crowsnestpassmusicfestival.com/uploads/1/3/0/7/130775677/2e4c62.pdf
    • http://ruvive.sagehillstables.com/uploads/1/3/1/0/131070420/nopesugikugiwam.pdf
    • http://gunigijot.olivetreedoc.com/uploads/1/3/1/4/131454012/332587.pdf
    • http://kukab.yellowstonegrizzlyproject.org/uploads/1/3/2/6/132681670/7163109.pdf
    • http://files.taiwancarparts.com/uploads/1/3/2/6/132695325/zenovosisulematoti.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/microsoft_access_2020_bangla_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/66435556864.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/9570176598.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/23521727897.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/wuderejodaxerabiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/debovepenajiwesubeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/laxesurefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/83405554118.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/nepuwoxozeriwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/62521062679.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/minecraft_heli_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/superlative_adjectives_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/fugasuvilusugomuwejegamu.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_off00005734.bin
3dc40834fbb5c785a35b1233c4768751e8c1e3342506aa85d94ca7584ea67d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5734 5544 bytes
font_01_sfnt_off00006a08.bin
91d9265d31ab35ab9aa03893166fdf7ba4ee2fb6f353e4bb6133ac745e1878a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 10228 bytes

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