Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7bd744c0bff846…

MALICIOUS

PDF

39.7 KB Created: 2020-07-31 02:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09562932e9e27e3bfb1a7cae5e10aa38 SHA-1: 48ee16ca085f8c4d14ecb6f799e4a3e5cdf37a68 SHA-256: 8c7bd744c0bff846f0e20c7ec61c5751029e57ed4d1785b9e467734a94843ab6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it's a generated PDF, likely for SEO purposes. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector.

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=andreas+moritz+pdf+download
    • http://files.turfcateringkitchen.com/uploads/1/3/1/3/131383493/c2aaa681207a.pdf
    • http://files.mydnaorigins.com/uploads/1/3/1/3/131381675/naduvolumulojajeju.pdf
    • http://files.thecounselingcompanion.com/uploads/1/3/1/3/131379060/zaxosujezasexirajov.pdf
    • http://files.msdorrwilbur.com/uploads/1/3/0/7/130739883/a4ce9935d6bcde2.pdf
    • http://files.msdorrwilbur.com/uploads/1/3/0/7/1307398
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumuwajufutoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/9170184890.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/rezowibawivusofiwedavotid.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3013/files/12147608446.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/sevigurokijina.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/xijexebamuvul.pdf
    • https://cdn.shopify.com/s/files/1/0429/5360/5273/files/gupibemujumokota.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/sojedawure.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/47698252256.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/vugunubirosoxekigez.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/94722865521.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/41242334662.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_off00005eb3.bin
dee799d3969b8ddbbde86bd2a041f544858f63f53ae0e25692ca4ca5e1b6a69d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB3 5108 bytes
font_01_sfnt_off00007005.bin
10161df5ca261e3f83dbdd1459f0eca1622cb91d247bcf58323d7b0a563bf150
pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 9800 bytes