Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba56ddd67163707…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 18:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca666b4b29014acd295e45288756d7e8 SHA-1: 838add99358a3b9341e09f2f4a99a2ccc774ef12 SHA-256: dba56ddd671637072c3d856afb7b7719dbe558452970a3673de82eec5feba4ff
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, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The primary attack pattern involves a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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=clinical+bacteriology+struthers+pdf
    • http://tanirebor.artemisassessment.ca/uploads/1/3/0/9/130968984/6484407.pdf
    • http://wabuzukop.plymouthschoolofmusic.com/uploads/1/3/1/4/131405927/3495722.pdf
    • http://sinilip.nojbarker.com/uploads/1/3/1/6/131606289/pekok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/89222494477.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1308/files/ladumususaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/tumbling_e_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/repelur.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/terminal_world_alastair_reynolds.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/pathophysiology_of_huntington_s_disease.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/87597171255.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/kezedirapuxezusavinileku.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0976/files/nogovirovokimogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/14600342594.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/26101184541.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/hips_don_t_lie_spanish.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_off00005f9c.bin
947695b91603c358d387231090120532a755226a4e0f7aabdf71bdf4509e8708
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 5564 bytes
font_01_sfnt_off00007277.bin
e3f334c1d451cdd5b72c61dbc5144d8ce0c297c6dc7e13f7e6ed032841ef5f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x7277 10944 bytes