Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b725eb2dedf21e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-11 00:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22234f06dbbfb558eb30e6ce29e6edc2 SHA-1: b8cb5b9059220f87559ff335b224afb34cce4890 SHA-256: c2b725eb2dedf21e2e4bde1566e5119e15955b1dc9e171f062820244a8d3881f
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body contains a URL pointing to a redirector, which is likely intended to lure users to malicious content. The presence of numerous links, many hosted on Shopify, suggests an attempt to obscure the final malicious destination.

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.ru/pify?keyword=courteous+expressions+worksheets+for+grade+2+pdf
    • http://files.northwestclarefamilyresourcecentre.com/uploads/1/3/1/1/131164236/9354691.pdf
    • http://files.russianspoon.com/uploads/1/3/0/8/130874369/8060980.pdf
    • http://pewusus.petiakostadinova.net/uploads/1/3/0/7/130738799/0a4846656456f9.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0611/files/bavogakanazokilonif.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/rohatgi_an_introduction_to_probability_theory_and_mathematical_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/fetewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/91558843693.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/72473224371.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/31275511825.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/zowokilubezonuwibege.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/53143365723.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/6472161545.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/28134327911.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_off00005c3a.bin
7a9e45f04a308400f13908f0903582ec071422b5bdb6e745fd2b90aeec842635
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3A 5532 bytes
font_01_sfnt_off00006f29.bin
0249f5a660e2166ed396804a4dbd1c860bd2a90060af3e248e41a6dfd42f1550
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 10440 bytes