Malicious PDF — malware analysis report

Static analysis result for SHA-256 370b6d4c7de8c3a6…

MALICIOUS

PDF

51.5 KB Created: 2020-08-03 05:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55bbb7f8693f2734aef26784748a789 SHA-1: 7b5e75c20758b30cb91535c255631308f4830032 SHA-256: 370b6d4c7de8c3a6e13c974d920531fdb305da09152641095efef8189e487abe
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a math book PDF. This indicates a phishing or social engineering attempt to direct users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs hosted on Shopify and other domains, likely part of a link farm to obscure the true destination.

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/wb?keyword=quantum%20cat%20math%20book%20pdf
    • http://kusolafin.tupuravida.org/uploads/1/3/0/7/130775320/7517406.pdf
    • http://files.cmefonline.com/uploads/1/3/0/9/130969220/a888a9a78b.pdf
    • http://files.shoanlo.net/uploads/1/3/1/0/131070561/kowuladusixevi-buzukavobedeze.pdf
    • http://files.eternalroundring.com/uploads/1/3/0/7/130740477/5176819.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/6319635916.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63908687591.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/28189127136.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/assassin_s_creed_revelations_trailer_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/6198675008.pdf
    • https://cdn.shopify.com/s/files/1/0440/7502/4549/files/labowimibuvole.pdf
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/kidemam.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/nezixilelomiliga.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/the_4chan_serial_killer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/baxijis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/visonupewepamuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/gamazenerovisexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/ginuridumivazaratopavige.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_off0000760b.bin
7e00c16523afccfb59a60c2be85d6b0f518c49abeaa55fce9823bc31022b8201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760B 5352 bytes
font_01_sfnt_off0000881e.bin
23f8af91678066fa0b778c3ffa60622ef7a45688a3c0542fed78bef4d2a524f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881E 10380 bytes
font_02_sfnt_off0000aba3.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA3 16164 bytes

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