Malicious PDF — malware analysis report

Static analysis result for SHA-256 50824331ea3a259b…

MALICIOUS

PDF

54.9 KB Created: 2020-08-10 19:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae44f7797937247c538ea63a22564e2 SHA-1: b5574c8f6f6e1bdd8924bf81c4c358c6940f91e7 SHA-256: 50824331ea3a259b4ef3ddbef8ff2a4c1c0d84b6c92075a2d1cdccb322133afe
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting the intent is to lure the user to click the link. 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=communicative+functions+of+language+pdf
    • http://files.1corinthiens15.com/uploads/1/3/0/7/130776218/tulutepe.pdf
    • http://files.mi-sheffield.com/uploads/1/3/1/6/131606368/niludavifek_rerodotite.pdf
    • http://files.jennifercreef.com/uploads/1/3/1/3/131398366/fuwoduvudemoriwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/topamuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/65141402132.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/givaxikevadaxajal.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/59848513596.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/install_compass_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/deezloader_remix_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/ziruru.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1252/files/alleluia_randall_thompson.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/89185417185.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4269/files/vijipura.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/weeknd_might_not.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/32792299560.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_off0000993d.bin
cc9e37fffc1133a89aa8ccbb9dabe1d05bf7d5d62cafc1f884ab5e7fb169a40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x993D 5344 bytes
font_01_sfnt_off0000ab63.bin
08648a0cb461eed8619045b18030ec0f6a275b70b6d730b0cb1a1dfdf89ddd60
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB63 10240 bytes