Malicious PDF — malware analysis report

Static analysis result for SHA-256 253521f5fb3bf49f…

MALICIOUS

PDF

38.7 KB Created: 2020-08-03 22:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93ad78027d2cd7cab6e9188aab72a3f SHA-1: a46168c1aca91e1084254ae9c8f9dc4193d97321 SHA-256: 253521f5fb3bf49fa1c3d575e2868a88f1fd4b86c18e580d97ea20667952b78e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external sites. One critical heuristic identified a malicious redirector link, and another flagged it as a PDF link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL is ttraff.ru, which is used to redirect users to other content, likely for malicious purposes such as phishing or malware distribution.

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=black+panther+coloring+pages+pdf
    • http://files.gallatinmontessorischool.com/uploads/1/3/2/6/132695828/pijemejo-wudovigimo-lurezupiku.pdf
    • http://files.fvmediacenter.org/uploads/1/3/2/6/132695832/4e2aa303cbbb2e8.pdf
    • http://files.sweetmarcelsocks.com/uploads/1/3/1/4/131452740/fecabaacd4520.pdf
    • http://files.calgaryburnsclub.com/uploads/1/3/1/8/131857112/8348565.pdf
    • https://cdn.shopify.com/s/files/1/0429/1834/6915/files/clasificacion_taxonomica_de_animales.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/73774540209.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/73815634285.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/rurouni_kenshin_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/punutowuputukerivili.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/gesutoxevasogix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/86244027486.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/najoxajefililigoxavaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7250/files/binugotaperorowotuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/35950917982.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_off0000586a.bin
8d27099e0c103dfb84bc124a0d311792dd05744543ed7277441d8e836daa08fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x586A 5528 bytes
font_01_sfnt_off00006b37.bin
4562abe7d140d4892fcb22ddca5fe340c5b16d7d44fc166456f748184d001c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B37 10032 bytes