Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc24b1ee3e375d1e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-01 23:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3988626a52598c0f516da153c5b947 SHA-1: f02202927b72375359d958426849b8edd1bd5557 SHA-256: cc24b1ee3e375d1e1ebfa39d61e5f05301f326684fadb60d3d403f8565099451
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=act+set+up
    • http://files.acweinschenk.net/uploads/1/3/0/7/130775108/zurelaxakikakuk.pdf
    • http://files.karmanlee.com/uploads/1/3/0/7/130739892/caf1ed.pdf
    • http://files.house-removals-surrey.info/uploads/1/3/0/7/130776757/lodavosefipepaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/4th_grade_math_vocabulary_cards_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/xaravosafeliker.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/dovoxetigodiruwowudaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4224/files/jane_fineberg_busy_philipps.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/53041646752.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/16882505331.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/97256164988.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/57474446730.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/worapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/xitojijagetufiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/fotalufimoxo.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_off00006f99.bin
93922c487bd00929d0fe957faba704c4ade5cbf499a81d1e9a3408c5037a0150
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 4576 bytes
font_01_sfnt_off00007f4a.bin
78ffb2f4281f8db78d416a892509a88dfdc66d5b10aec01e89f5c1e7a7aea41d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4A 10316 bytes