Malicious PDF — malware analysis report

Static analysis result for SHA-256 138dc4a5574f911c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 02:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74117044ba341045e1dcb9b220165b7 SHA-1: fda3298c75e7c61d3e2b3e4385306c6c99704f36 SHA-256: 138dc4a5574f911ce8202e4ebed43dcac09f615d700daa0f8abe5058fbd5a2fb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body also contains the same malicious URL, suggesting an attempt to trick users into clicking it. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent, likely for phishing or malware delivery.

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.com/pify?keyword=expressvpn+unlimited+secure+vpn+proxy
    • http://files.x-amvip.com/uploads/1/3/2/7/132712127/sefiratuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4311/0564/files/patorekovatisaselaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/7448/4379/files/nunozipumisanuwopozenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/capablanca_s_hundred_best_games_of_chess.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/19149239994.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/63508261307.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/dawefixolewiregupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/math_binomial_theorem_solution.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/bww_lunch_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/pifasaz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630b.bin
15724260267d3e2acbadd5faa6d30bf52e7dc5af7cc8a791d3db05c4683b00be
pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5196 bytes
font_01_sfnt_off000074b0.bin
9eafe36cbb4a41c22739b6ea6ea42d9443ccbf64f515f89d4a007fb027031d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 10428 bytes
font_02_sfnt_off00009888.bin
fcf5cf03075fe45ee1aa9e10002794be2d4aa61427b5695c4cb84c7bc7f55281
pdf-font-stream PDF embedded font (sfnt) at offset 0x9888 16616 bytes