Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2006d913e8429…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 07:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82dd431841e1e37fb393a8e8111cb278 SHA-1: b0a5c857bc9ca52cf22bbac37554e8419ca6e830 SHA-256: 70b2006d913e8429a7f14317f0296e00bf24a89e5613a08dcfb8b26335878a70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm, suggesting a tactic to manipulate search engine results or lead users to malicious content. No scripts were extracted, but the presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic point to a malicious intent to redirect users.

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=activity+based+costing+abc+pdf
    • http://doxuzume.forestburgbaptist.org/uploads/1/3/2/6/132681947/3096031.pdf
    • http://files.boothillproductions.com/uploads/1/3/1/4/131407292/wapibe_bejirekufa_ximajuxonarug_wegadubil.pdf
    • http://files.bethanysphotos.com/uploads/1/3/1/0/131070753/jawuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/myra_estrin_levine_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/plano_metro_y_cercanias_madrid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/73585726428.pdf
    • https://cdn.shopify.com/s/files/1/0435/1636/2904/files/mansion_nf_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5908/files/lomipilevosamewir.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/3266531115.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/8663068019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4687/files/bumudigumoderunefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0391/files/43274509477.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/jodope.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/vomovatupuniruzibozojezov.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000613a.bin
5bdd43b4db950a443f89de8cc14d9ed0c59c30d54acca99f1879e10e13c7b6ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613A 5488 bytes
font_01_sfnt_off00007412.bin
818284c262f289aa42ab4401f517a96628fa478c9eeaf37c9ad95f77c8832e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7412 10112 bytes

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