Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c453ac8ce0c388f…

MALICIOUS

PDF

36.3 KB Created: 2020-08-14 07:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67771a7c8d5c9200afec18687d41147 SHA-1: e67f7fc1e239babf96cabba3b77267f64d182c1e SHA-256: 9c453ac8ce0c388fc3a5d65c0304b319eaba7cd231c98b745abb7e3da7dcac02
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or credential harvesting. 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.com/pify?keyword=baadshaho+movie++hd+online
    • http://files.abookstudio.com/uploads/1/3/0/7/130739081/5558002.pdf
    • http://files.lgpristineclean.com/uploads/1/3/0/9/130969204/kipimafo.pdf
    • http://fetujog.simhaco.org/uploads/1/3/2/8/132816202/48dc961a78cd6fa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/zibenifubelawa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7638/files/kubota_b7800_specs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/gibew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/59241882552.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/86182611061.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/19729413438.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/guvumijif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/gakibisotokigitamasaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/95157812187.pdf
    • https://cdn.shopify.com/s/files/1/0438/9765/1352/files/66455367472.pdf
    • https://cdn.shopify.com/s/files/1/0431/1197/3026/files/5650361540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043f6.bin
8c882f2e0c2572d3ff9b0b2bbd7127a1a999e98516b775364386192e299948a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x43F6 4788 bytes
font_01_sfnt_off0000540f.bin
8fd3b1504eb16133390857d12191162b23f030d97b74ead4e9ade5f41454108b
pdf-font-stream PDF embedded font (sfnt) at offset 0x540F 10016 bytes
font_02_sfnt_off0000763a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 4324 bytes