Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbd9d115efc98a0…

MALICIOUS

PDF

39.8 KB Created: 2020-08-20 04:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da85647cd80ddd2d5d7b14b214a73b71 SHA-1: 38898557c51317e408a9dca9a4f1913e2651aeb4 SHA-256: efbd9d115efc98a0490f7fa95ffeabb6c05f1d8858c95d07598d8450319e39d8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though partially corrupted, contains text related to exporting lists to Excel, which is likely a lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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.cc/pify?keyword=export+list+to+excel+sheet+c%2523
    • http://files.brandonarthurshindolcsw.com/uploads/1/3/0/9/130969183/gapujekoga_kipav.pdf
    • http://dabasipe.timthewaterguy.com/uploads/1/3/2/8/132814838/d98110f.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/different_types_of_bandaging_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/munul.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/simibi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0610/files/ibps_po_exam_notification_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/introduction_to_microelectronic_fabrication.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/pdf_password_crack_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/5750/4668/files/80032729165.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/telecharger_journal_echourouk_algrie_d_aujourd_hui.pdf
    • https://cdn.shopify.com/s/files/1/0437/4623/0426/files/cartagena_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/hematology_drive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33647917740.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_off00006104.bin
9d554f062c58c83ad3059317ab18ce902853fd9390edc4524ce87b55a171abcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 4836 bytes
font_01_sfnt_off00007175.bin
079d31d71b169ec0477e4942e58646c1544f9931202927724e8abfaf85dc9d35
pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 9800 bytes