Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b34979512abb7…

MALICIOUS

PDF

51.2 KB Created: 2020-08-12 08:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce9b6577bdf3e48d638f078891957eb7 SHA-1: c4621f39ecaa9b8503ad6696fbbfc813bfbaaf15 SHA-256: a05b34979512abb7c9b42148040cd2005a8641a7000407c54e7c1686ffaeba55
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'learn german language for beginners pdf', suggesting a phishing or scam attempt. The presence of a large number of external PDF links, many pointing to Shopify domains, indicates a link farm designed to obscure the malicious redirector.

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=learn+german+language+for+beginners+pdf
    • http://files.thentls.com/uploads/1/3/1/4/131406434/dc9e801e36e6.pdf
    • http://files.cameronsuarez.com/uploads/1/3/2/6/132696330/dovunoxed-menibadem-mowose-zekivi.pdf
    • http://files.biglittlecomedy.com/uploads/1/3/0/9/130969218/1428843.pdf
    • http://peluvozum.jackpotvapr.com/uploads/1/3/2/8/132814930/wekikigedufiv.pdf
    • http://juduv.yasminesinno.com/uploads/1/3/0/8/130874359/5111f2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/tixoxuvadawus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/autores_de_libros_de_administracion.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/calculus_4_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/kigogezamupud.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/max_heap_implementation_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9132/9173/files/1938479650.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/59727094724.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0992/files/mujisulidapemovedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/substitution_effect_in_economics.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/convert_kindle_to_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/gakifebonomewiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7415/files/pisutirarimifixusobituto.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/mubatakutibos.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_off00007a13.bin
4d20f7274902332c07c80f433b0247521cf87e8d0fb14affc85e3e6060a501ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 5244 bytes
font_01_sfnt_off00008bbe.bin
755cd373645b0dd632db5e2ef64321aefec91c982334b9e438f1ac64c09bec5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBE 11672 bytes
font_02_sfnt_off0000b197.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 4324 bytes

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