Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae15cf09389e67e…

MALICIOUS

PDF

49.5 KB Created: 2020-07-11 17:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c67caeb2660490b0011a0aa8c6e35f04 SHA-1: 81742d8d0ede3035373ae187d8533411974ded90 SHA-256: fae15cf09389e67e2a4732a4a1c342b4fef1ab0bc6ae3df492efcee2438f4e28
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to redirector infrastructure. One prominent link, 'https://ttraff.cc/pify?keyword=dnd+5e+stronghold', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to direct users to malicious content via these links. 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=dnd+5e+stronghold
    • http://files.electaylin.com/uploads/1/3/2/7/132740320/8322645.pdf
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • http://files.mdchildrenentertainment.com/uploads/1/3/0/8/130814907/8646779.pdf
    • http://files.enzobrand.com/uploads/1/3/0/8/130873758/tixenoribepox_dobobuxu_zotodaxuxuga.pdf
    • http://files.belllog.org/uploads/1/3/0/7/130775827/2358242.pdf
    • http://files.kilkennyfootclinic.com/uploads/1/3/1/8/131872037/3214212.pdf
    • http://files.threeaineconsultancy.com/uploads/1/3/1/0/131070125/587526f65.pdf
    • https://jovufube.files.wordpress.com/2020/06/wosakilaxe.pdf
    • https://dazapume.files.wordpress.com/2020/06/88927230353.pdf
    • https://mitifej.files.wordpress.com/2020/07/wezegoweseri.pdf
    • https://nafevulaxa.files.wordpress.com/2020/06/23942444201.pdf
    • https://dulaxagaro.files.wordpress.com/2020/07/31465608028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/36340942612.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/porobumepizojuredaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/sinifof.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/fidipububuxavafugifivaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rexalomofovuwazeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8917749958.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_off0000847d.bin
d059972626abfdee59f866f3f0a20668e49a538da08f100bb45e5b7703386379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 4740 bytes
font_01_sfnt_off00009492.bin
23f33dc2a7ac3a00fdceda8d3f373f295c9ae046016e0bc0802f6e8250311a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 10580 bytes

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