Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4300927dcc24aed…

MALICIOUS

PDF

39.1 KB Created: 2020-08-21 03:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cab590f3f74cefdbad52b5ccb605fd6b SHA-1: 7305b89d6138e6f204d435e5e4a9ddec9fea298b SHA-256: f4300927dcc24aed18eece7aef72d5df3982758831bb83ce2f1ccfe2d435ac31
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a redirector service (ttraff.ru) which is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body itself appears to be a lure, containing text related to 'logarithm practice problems and answers pdf' and metadata from wkhtmltopdf, suggesting an attempt to disguise the malicious links as legitimate content. The primary attack pattern involves redirecting users through malicious infrastructure.

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=logarithm+practice+problems+and+answers+pdf
    • http://files.diamonddusterssoftball.com/uploads/1/3/0/8/130814535/fipeboruxubuw_vifuverejefemus.pdf
    • http://files.tuitionaxcel.com/uploads/1/3/0/7/130738641/vitilepitorop.pdf
    • http://belawalen.mesmanfarm.com/uploads/1/3/1/4/131406695/sedinixuwotav.pdf
    • http://budog.whattodoincatalonia.com/uploads/1/3/0/8/130874253/a54a4e8.pdf
    • http://fabitiw.landmarklodging.com/uploads/1/3/1/4/131407498/fa6ff5fa2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/rubiks_cube_notation.pdf
    • https://cdn.shopify.com/s/files/1/0436/4586/2041/files/95684664068.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/mariage_d_amour_sheet_music_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/56581567406.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/1110949246.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/vafipadafoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/lobadewipepavujixabivo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/86972801890.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/les_cerfs_volants_de_kaboul_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/vokikek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.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_off0000519d.bin
1afbd734be7b1cc0c7ac7281004b8eda978e53d35a2f45cff39a2d45a63e649e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519D 5740 bytes
font_01_sfnt_off0000650d.bin
aca796fdb771c563e1f5a841929405dd0539e569733c2400e6d02b12e20f487c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 13288 bytes

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