Malicious PDF — malware analysis report

Static analysis result for SHA-256 659571d6959b1c6e…

MALICIOUS

PDF

60.3 KB Created: 2020-08-15 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e13bc12529be847bf589196029722f SHA-1: c90c30d58af158cc7efb89fb63418856adacf0ff SHA-256: 659571d6959b1c6e6ece67a6bc1502208d01bc92d9867e70ad41eb82be076ad9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. This URL is also present in the document body, suggesting an attempt to trick the user into visiting a malicious site. The presence of a large number of external PDF links further indicates a link farm, often used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=start+android+app+via+adb
    • http://vozipuk.bevilacquaguitars.com/uploads/1/3/1/4/131437544/8664103.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/how_to_install_opencv_in_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/sodedaruvewagutisiwi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/41450506992.pdf
    • https://cdn.shopify.com/s/files/1/0437/4629/5959/files/89_as_a_fraction.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0598/files/alphabet_letters_printable.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/62755068892.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/jekerevufudenesoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/murawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/benchmark_advance_weekly_and_unit_assessments_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0440/3937/2965/files/39971993519.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae74.bin
0a38b485a59a30404a5cf8682e0281eb710140869059ccc8045d204fe66ba1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 5048 bytes
font_01_sfnt_off0000bfa5.bin
96392bf44afbdf7999fc192056124c89e207b00a2a609b2af86a3dcf3311e420
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA5 10836 bytes