Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba5754ae1062315…

MALICIOUS

PDF

50.7 KB Created: 2020-08-19 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1cab19ac1f37d16771d102a8d66daed SHA-1: 8743565d39362f12ef1af404b659e9993c63c8b3 SHA-256: 8ba5754ae10623152504ebb66b92acf46f859e32356efe2d19b889a9d3734f2e
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple links pointing to shopify.com and other domains, likely for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=chauka+chhaka+odia+movie+song. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the redirector strongly suggest a phishing or malware delivery attempt.

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=chauka+chhaka+odia+movie+song
    • http://dawuxejop.tavisdupreez.com/uploads/1/3/1/4/131438304/migakiwutekufalawez.pdf
    • http://files.fortworthdst.org/uploads/1/3/1/0/131070160/tepukuxivifol.pdf
    • http://files.psychosocialresearchgroupunsw.org/uploads/1/3/1/3/131384081/nejadibebasel.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/minamobureja.pdf
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/51862093688.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/winubituzokevijozod.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4339/files/80508218576.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/fugutudinav.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/lonely_planet_turkey_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/98199265875.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/5729641345.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/kajuvuwurafarireze.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/73940087273.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/ocarina_of_time_official_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/galaxy_a50_specs.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_off00008133.bin
82358d75fcdf3d4ad5a9629ef06f38bd66ffb379256df7cfa6b9536dbbd214a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8133 5256 bytes
font_01_sfnt_off000092fb.bin
4c9b5311a75be2bf4c78d2f112f4225efc77bd3982c5841226b8fb80b52ec5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x92FB 13832 bytes