Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c238c0aa4bc437…

MALICIOUS

PDF

34.2 KB Created: 2020-08-26 13:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e45abf02c444102a3011cca7ce9fad76 SHA-1: 4f29fadc47239a766d2e90958c5e68d070282c03 SHA-256: b7c238c0aa4bc437ae7fca7d81511c04d7058efac614e2865ce8b7f3b00d03c5
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm strategy. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.link/pify?keyword=kel+tec+su+16c+for+sale', which suggests the document is designed to lead users to harmful 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.link/pify?keyword=kel+tec+su+16c+for+sale
    • http://delegikuk.paloaltoballet.com/uploads/1/3/2/6/132681670/bozajanivobira-soxewibi-dolirisiwuv-jiladojapog.pdf
    • http://files.thankgodforsex.org/uploads/1/3/0/9/130968985/eb0bb7b8e29abc.pdf
    • http://vetopera.centroppsf.com/uploads/1/3/1/6/131606407/fozurovimuki-xukune.pdf
    • http://files.personalizedbyemily.com/uploads/1/3/1/1/131164100/pidajaju.pdf
    • http://files.playersclub751.com/uploads/1/3/0/7/130738679/sojote.pdf
    • https://cdn.shopify.com/s/files/1/0433/9954/4984/files/toserewog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/worobejedulomone.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/zupepojomivawerakobot.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/atex_classification_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/5014/6723/files/kazovovuxewunafotaxupenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/tozumawaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/44436720224.pdf
    • https://cdn.shopify.com/s/files/1/0459/8405/5463/files/gymnopedie_no_2_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0458/2752/2723/files/happy_birthday_wishes_for_friend_images.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/22855708132.pdf
    • https://cdn.shopify.com/s/files/1/0460/8596/3940/files/sales_appointment_email_template.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_off0000458e.bin
824f493f3ee9b28b6fbc0909770179883bbef1fdd427c371bbf5f822f18b82f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x458E 5052 bytes
font_01_sfnt_off000056d2.bin
186bae17500338144f9e9326c8bad28c04979ebaa666c5f24252f3c6da3bf06c
pdf-font-stream PDF embedded font (sfnt) at offset 0x56D2 10476 bytes