Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4654dff36aceb6…

MALICIOUS

PDF

45.1 KB Created: 2020-08-07 23:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14a605bb4a82efc9a3f6ce4a0416e70d SHA-1: cb7ab88a549adf8f04b7683429c681b5cc1cdfb8 SHA-256: 8e4654dff36aceb6f4f4a20c7d3d71ddd05b7f8c9f6087baf60dcda97f28d673
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'admin assistant interview questions and answers pdf', likely a lure to entice users to click the malicious links. No scripts were extracted from this sample.

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=admin+assistant+interview+questions+and+answers+pdf
    • http://files.educationaladvisingandconsulting.com/uploads/1/3/1/1/131164231/5201165.pdf
    • http://wexubum.50walks.com/uploads/1/3/1/0/131070374/fdab919.pdf
    • http://files.ankorsstreetcollege.com/uploads/1/3/2/7/132740375/dizibebikebebizob.pdf
    • http://files.homerbiology.com/uploads/1/3/1/6/131636988/liguwunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/dejovilagelubeguzuvemuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/revasodabopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/15139862959.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/31084830089.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/83496385174.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/8005084017.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/80892345761.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/10010938888.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/58356221956.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/verbal_ability_for_gate.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/wiwirugaxumajizepipiwix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/bitop.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/2241686501.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/xivudoropewonin.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_off000071d0.bin
1120b07c77dcce24256e04be7e8dcef2df834446fee4f2672e4448015ade9e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D0 5424 bytes
font_01_sfnt_off0000843c.bin
7294b42d318c322889487b5773ccecad05b303836c24fe189a9c4db58b55619a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843C 10060 bytes

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