Malicious PDF — malware analysis report

Static analysis result for SHA-256 f992498c12a3c644…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 15:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9123fc5daf45c4a7698b6b4ddec3038 SHA-1: 265c728b9661565692ebd9c2aa6f1422d5c00351 SHA-256: f992498c12a3c64478356ce381d540e86e739db49168d1e51200e9d2d032f9f7
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious content, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=astro+vision+tamil+horoscope++full, suggesting a lure related to horoscopes. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-scraping or SEO-poisoning attack pattern.

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=astro+vision+tamil+horoscope++full
    • http://files.glennhousevr.com/uploads/1/3/1/6/131636642/sifinomol-kanuri-pilozesob.pdf
    • http://files.seminoleculturalarts.org/uploads/1/3/2/6/132681342/nitowiraz_lujutunugige_lojivipozeduv_nujax.pdf
    • http://files.uppereskmusic.com/uploads/1/3/2/6/132682882/vasobepo.pdf
    • http://files.gatewayreadingcouncil.org/uploads/1/3/0/8/130814605/ece4718b7.pdf
    • http://files.nikokrivanek.com/uploads/1/3/2/6/132682134/zimopozejininokilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/56770165975.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/budapest_map_metro.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/44729753933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/kofotarebepepijojugej.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/16796101865.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/60053927730.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/29508119601.pdf
    • https://cdn.shopify.com/s/files/1/0450/0160/5278/files/metal_forming_process_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/7829517366.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/pikesedowamuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2317/files/word_with_friends_cheat_apk.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_off0000616c.bin
8bb3d0a8218c84241f9dff2d019ecdccdb61e76578441124679acfce04db1ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5304 bytes
font_01_sfnt_off00007350.bin
8a12e48477dc733d82fa7c00ecee01b1aad7ea69aa096b6c60cdee64bae0875a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 11836 bytes

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