Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42074c19827a780…

MALICIOUS

PDF

55.6 KB Created: 2020-08-03 19:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6a22ac4afcfcba3676ae10318c4f87 SHA-1: 1407c9723121add29e009b44b0e0c204ff4e54b0 SHA-256: a42074c19827a780ceee624a92e8a241383498cf5a756b96aad0ea4a63061853
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to academic subjects, likely serving as a lure. 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=understanding+culture+society+and+politics+grade+11+pdf
    • http://povutevon.michaelronaldblake.com/uploads/1/3/2/7/132741099/bosan.pdf
    • http://files.aimdistributing.net/uploads/1/3/1/8/131856556/wikixebevowezija.pdf
    • http://files.darrennixon.com/uploads/1/3/1/4/131437576/xuxopawax-sudeja-vobovuragiboj.pdf
    • http://files.cloud509ml.com/uploads/1/3/1/1/131164024/xodojolozebop.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/buzusabokov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/eminem_berzerk_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/21115512998.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/maxazebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/74777851312.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/wabat.pdf
    • https://cdn.shopify.com/s/files/1/0432/4012/8671/files/jidolibepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/89044283291.pdf
    • https://cdn.shopify.com/s/files/1/0433/2139/3320/files/97137143555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/22687946918.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/tisit.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_off00009a17.bin
8bed6e029576f527739ac4168f5ae6927c18096a795c7bfa3a4078c520dcb616
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A17 5468 bytes
font_01_sfnt_off0000acd5.bin
13ff4b4b54e87ae5f94afa7ccd00708e474eb0d6a886cbe61c0cbd0fc5cc0e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 10708 bytes