Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b324141d85273b…

MALICIOUS

PDF

39.5 KB Created: 2020-08-28 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56cfdc7a80d867daa42d200e10d40dd SHA-1: 71997110d2646d082244d2150bd3f7c3f41bd3c8 SHA-256: b7b324141d85273b34b8a6381cf97e6bbf693d5964a193a786bb8b235456a962
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the text 'White dwarf magazine september 2019' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=white+dwarf+magazine+september+2019
    • http://sizil.lauriannefiorentino.com/uploads/1/3/0/8/130874284/sekiwapuz_kururarup_tajelevimupixot.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/gdb_commands_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/87127269405.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/6005/files/resume_format_sample_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0435/6423/6968/files/melajomavatone.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/rudixupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/antares_autotune_efx_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/free_editable_roadmap_template_for_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0437/8142/3262/files/robatubetolavilizujonax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/mvc_controller_return_same_view.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/jewunipiguwekijurupewev.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_off000057e0.bin
4f124aae39a218f3678c88a85cc500710c967bc5a70a18e2a65538b7ea7426e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x57E0 6200 bytes
font_01_sfnt_off00006cfa.bin
a81bb51688ddff4045a8613ab781a041afa49c55d590364b882d5f5597bc606d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFA 10628 bytes