Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d0ba6b85483198…

MALICIOUS

PDF

48.7 KB Created: 2020-08-31 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcdb9b1370e10f537cb42ae17a8490d9 SHA-1: 6f023433798b766499febaaaa77ae79ab377e8be SHA-256: 56d0ba6b85483198411d55449dc2f08b6e93e595d655a9db9b78d8f000e754c5
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a "Black desert online gear guide 2018". This indicates a phishing or social engineering attack aimed at directing users to malicious content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=black+desert+online+gear+guide+2018
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/56069237182.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/71162035137.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/es_capate_luis_coronel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/kebimotapimigoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5557/files/12589747350.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/vawiwabuxixapogewapuvuk.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0de796fada64556b4cb00baf59f5ec7.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_b0a57509b6f74e1cae9c546633ad6c3b.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_off000074e3.bin
4c9de691294c7976974d014e221e94efa142f81e58051af6d6494ccbbe21ff21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E3 5740 bytes
font_01_sfnt_off00008874.bin
7e02e0347b1b6b1c1dc9f7e3b9e16548d110215eee0a251934ba5521fa718039		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8874 14896 bytes

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