Malicious PDF — malware analysis report

Static analysis result for SHA-256 58970c8e34edcf1f…

MALICIOUS

PDF

35.7 KB Created: 2020-08-04 19:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef4fa28b290b08ea46e22ed06293014 SHA-1: ba99346e20bb55cd820d2346ac507eb63d057129 SHA-256: 58970c8e34edcf1f51d79975ad356f3d4b65da202894d4f3e6c38ea5ab507abf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for an ebook download, which is then linked to a malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to attract search engine traffic and distribute malicious content.

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/pify?keyword=bhagavad+gita+ebook+pdf+download
    • http://files.memorylanesg.com/uploads/1/3/0/8/130874655/3d76d67b77759a2.pdf
    • http://files.greenpiecenursery.com/uploads/1/3/0/8/130874180/786f9e54431b0fa.pdf
    • http://files.vandalsgames.com/uploads/1/3/0/7/130738614/zerari.pdf
    • http://files.padreamplayground.org/uploads/1/3/0/9/130969708/40a658d699.pdf
    • https://cdn.shopify.com/s/files/1/0436/7928/5401/files/lakusukawagididegagodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7607/5164/files/31997411337.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/fozagesixiberitupimizidan.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/togerikuxiwofetujon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/79513841169.pdf
    • https://cdn.shopify.com/s/files/1/0434/4014/4534/files/tavur.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/lapufakapar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/64472460825.pdf
    • https://cdn.shopify.com/s/files/1/0434/1484/7655/files/les_choristes_vois_sur_ton_chemin_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2291/files/21171710462.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/pegolowixizafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/millennials_and_technology.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_off00004d90.bin
42b243bd7536b9bb47f4cf12d0bac29e1d76b823c4e7336d65f9a71750225d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D90 5432 bytes
font_01_sfnt_off0000602a.bin
857351ff013629e77508bd3fb1537a444ea66dbb2801f8f346059881699387bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 9788 bytes

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