Malicious PDF — malware analysis report

Static analysis result for SHA-256 403f3433651b9fc7…

MALICIOUS

PDF

38.5 KB Created: 2020-08-14 21:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a5b9befc7fd13dbac771e17c3efd6e6 SHA-1: 01ae48fb69a1a0045e96f960078c4486a1711a18 SHA-256: 403f3433651b9fc7ea7f62e52d40ba3332f8b3daf26549ab3eeb9aab3bc277e1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "bar chart template powerpoint". The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports this assessment. No scripts were extracted from this sample.

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=bar+chart+template+powerpoint
    • http://raruvuj.myhandtub.com/uploads/1/3/1/8/131856917/222c7725a1e82.pdf
    • http://files.jessrimington.org/uploads/1/3/0/7/130775971/608b9b5c72.pdf
    • http://sadima.madisonwicbdoil.com/uploads/1/3/0/8/130814017/jusoxisa_mamokulirevises.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/absceso_hepatico_piogeno_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/31753356879.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/55623966943.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/78031630257.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/pathophysiology_of_heart_disease_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4561/6792/files/kaluzobokanariroku.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/sailing_to_byzantium_symbolism.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/91946138252.pdf
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/how_to_dump_a_3ds_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.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_off00005b5d.bin
7c6a157dbfdf8deaa3886acfdb44d6807f083d18fbb1ff914138f47b9729413c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5D 5136 bytes
font_01_sfnt_off00006cbd.bin
981fddf407e158321ac9fac45fb0f889f64858e5ccb6ea427cf6381c5df6e242
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 9652 bytes