Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c93ff63ab43ca93…

MALICIOUS

PDF

43.3 KB Created: 2020-08-15 04:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c37cc92ebd75b07197643c0d64e0bf7 SHA-1: c4a9526de4e2777bc238db7e5f52e578a54b542f SHA-256: 4c93ff63ab43ca932f524a3caf3748dc0a310bc51e6149e46c68bf1505a57885
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to external PDFs. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=manualidades+material+reciclable+botellas+plasticas', which is also flagged as a malicious redirector. The ML classifier strongly supports a malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

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=manualidades+material+reciclable+botellas+plasticas
    • http://files.njsaferatios.com/uploads/1/3/1/4/131453463/lemudasud.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/zezovigabubipojedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/zidedot.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/csgo_trade_ups.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/debikilifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/lonusipifaku.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/46631_hayes_road_shelby_township_mi_48315.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/manfaat_daun_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/sanerurudukitavupik.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/bugisawevuvazulixojares.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/don_quijote_dela_mancha_instituto_cervantes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9089/3213/files/blks_aziza_barnes.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/34380295056.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632b.bin
5325f106951f0d00de410aa83f84cc33b7b3b92e467e428421df4cb42930b5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632B 5364 bytes
font_01_sfnt_off00007534.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7534 1800 bytes
font_02_sfnt_off00007dc1.bin
c449fa2a7c28177de6a4e543f2478e723d920e7d59f9c2e0d354d40fafee0b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC1 10048 bytes

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