Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edc5ca3d3295f1a…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 21:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c158cff8a81efba5126cf852bf452dc0 SHA-1: 2ffcb6d19138ee8684ff64e5a0514cb2252ef34d SHA-256: 1edc5ca3d3295f1a8d4ddad6b77bbef33ce2cf02de3a263820514d28d8eb57c9
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=the+falling+leaves+poem+worksheet', is designed to redirect users to malicious infrastructure. The document also contains a large number of embedded links, many pointing to Shopify, which is flagged as a link farm. The primary attack vector appears to be social engineering through a seemingly innocuous document title, leading to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=the+falling+leaves+poem+worksheet
    • http://files.the4goforth.com/uploads/1/3/1/6/131637896/96cb4b4.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/91704665930.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/chacha_chaudhary_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0460/3527/1844/files/rockstar_social_club_gta_5_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/0129/6534/files/tidasa.pdf
    • https://cdn.shopify.com/s/files/1/0461/8479/2227/files/90386647944.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/bertolt_brecht_gedichte.pdf
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/zatuxumevetujabuxilur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/13834516910.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/mononekamexefebifola.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/pevazogowilevowi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/fisexalajulezaman.pdf
    • https://cdn.shopify.com/s/files/1/0429/5032/8486/files/plasma_atomization.pdf
    • https://cdn.shopify.com/s/files/1/0434/3863/7208/files/41123219716.pdf
    • https://cdn.shopify.com/s/files/1/0446/8460/7641/files/13853371356.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_off00005e0e.bin
f31e5e25ccc26c29143cf59bc5a4ff31b47081c10902a5579480ba6ef91433ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0E 5480 bytes
font_01_sfnt_off000070a2.bin
8a9b618fca9b2795f627e07cb203df19143c6bc96ed60a336ff5173ba1545539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A2 9984 bytes

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