Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f9f2924c6e5d07…

MALICIOUS

PDF

54.6 KB Created: 2020-08-10 03:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d84b0efd57dd8ddc0c71fd1e182e9d SHA-1: 11a5ffb72c1706901777e8099cd3fb87b06010d2 SHA-256: e0f9f2924c6e5d0710abf78a8d97265473fedcd113bacc1e844b446f33e8f53e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is designed to obscure the final destination. The document body, though partially corrupted, contains text related to 'Steuer anlage v 2020 pdf', suggesting a lure for tax-related information. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=steuer+anlage+v+2020+pdf
    • http://files.dappervintagerentals.com/uploads/1/3/0/8/130874015/dizajavu.pdf
    • http://files.michellefairley77.com/uploads/1/3/0/8/130873979/narop_vumuxilefino_vekug.pdf
    • http://files.goodrichscience.com/uploads/1/3/0/7/130775762/zojopun_wojumikinojoruw_sawodumavotores.pdf
    • http://files.planartsnetwork.org/uploads/1/3/0/9/130969220/mulut_mudopemevofiw_wofesi_duvapoxat.pdf
    • http://files.tippinggurus.co.uk/uploads/1/3/1/6/131606630/8278456.pdf
    • http://files.planartsnetwork.org/uploads/1/3/0/9/130969220/mulut_mudopemevofiw_wofesi_duvapoxat
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/25628002299.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/buxesanevitid.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/wozojizenumodegaleku.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/jopukejup.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/fuwipuveno.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/69657357149.pdf
    • https://cdn.shopify.com/s/files/1/0444/4625/3222/files/arabic_geometric_pattern_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/asvab_for_dummies_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24370467333.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/99049953550.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/fozixafavibologijumatot.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/what_does_looting_do_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/46893627389.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7383/files/built_to_last_james_collins.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_off000093e9.bin
9a3f9e1c3e88e7f3b33fff06aac61b2e27066749ed010fd2135e9242b2cadfd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E9 5468 bytes
font_01_sfnt_off0000a69c.bin
fb6fdc3dea0e5b913164594cf7bcbb440d8c1dae86547e1682239c9c2877c39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA69C 11416 bytes

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