Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4734bb94ce2b626…

MALICIOUS

PDF

53.1 KB Created: 2020-08-19 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34d1188dce2a961d2657513cd6a0494b SHA-1: e078f104ad8a8a3612f4ec09f2b35e16549373c4 SHA-256: e4734bb94ce2b626d42c2a962f0d7581e347acfdfde0c675697d1d6b9f801d6a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a 'payment request form'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous external links, many pointing to Shopify-hosted PDFs, suggests a link farm designed to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=payment+request+form+uclu
    • http://rixal.abrahamsbox.com/uploads/1/3/1/3/131382134/7348221.pdf
    • http://files.socceriqeducation.com/uploads/1/3/1/8/131856034/gemokekexa-xajazepibi-zufomobo-mabatubivotozif.pdf
    • http://files.keepmovingforwardcounseling.com/uploads/1/3/2/6/132695575/2686724.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/71922107174.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/html_to_base64_image.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53551688275.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/84435511077.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/zupome.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/vesopiruzevuseru.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3695/files/asmedia_asm1083.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/65237794062.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/catisma_18.pdf
    • https://cdn.shopify.com/s/files/1/0451/0570/9219/files/amando_a_pablo_odiando_a_escobar_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/fipep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/31275762786.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/99968183734.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_off00008476.bin
0d3ac5a991d2811110e5d1a85c0b42ce7b5561dfc34e534962bcd6b71184532c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8476 5088 bytes
font_01_sfnt_off000095b8.bin
adc484ae90678ff413699083bd0840574473ce83d87435fce669d71018eb0f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B8 10548 bytes
font_02_sfnt_off0000b9ae.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 4324 bytes

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