Malicious PDF — malware analysis report

Static analysis result for SHA-256 491116a4e85a0d97…

MALICIOUS

PDF

46.0 KB Created: 2020-08-11 18:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0dbd47271e5e0c8c4a15c3664e1e89e SHA-1: 7fad525b37307f1a10d48918ecc1aae03f6e0c38 SHA-256: 491116a4e85a0d97a3c3444464dda575cb47996b651ff3c4cc5643e546f0d272
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a psychology PDF, which is a common lure for phishing or malware delivery. The ML classifier strongly supports maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other URLs that appear to be part of a link farm, likely for SEO poisoning or to obscure the final destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=abnormal+behavior+in+psychology+pdf
    • http://ditadixes.hissyfitcoons.com/uploads/1/3/0/8/130814328/91fa71.pdf
    • http://lolorobi.berreyart.com/uploads/1/3/1/3/131379730/lijokiwetube.pdf
    • http://files.thesharedagenda.org/uploads/1/3/1/3/131381204/4355978.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/roman_catholic_bible_tagalog_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/ripovagix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/wazesafiladuruxev.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/12539460943.pdf
    • https://cdn.shopify.com/s/files/1/0445/6002/3711/files/umass_dartmouth_login.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/xoxukarukuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1114/files/accretion_dilution_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/free_helvetica_font.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/52894873024.pdf
    • https://cdn.shopify.com/s/files/1/0447/4968/4885/files/new_cutting_edge_advanced_teacher_s_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/accuweather_douglas_az.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/vugexowa.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_off00007511.bin
004b7924391c47d3e1533f6de5eafd9e3f7da93f23a1b0d14522233b0736f106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7511 5860 bytes
font_01_sfnt_off000088ce.bin
80418fda48ce433e3f32425d4241dfe4797858fef67df7a36cb540de71e4fb3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CE 10056 bytes

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