Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d8035fa3a7bcb5…

MALICIOUS

PDF

35.9 KB Created: 2020-08-17 07:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 676f216b29790d875826620274d37ab6 SHA-1: 172fd2c653a1163679fb8d110364b30016444ae1 SHA-256: 16d8035fa3a7bcb54ff80709316f5fb31447617b92b724b4a423c3fae3bd9777
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, with the primary redirector pointing to a malicious domain. The document body, though heavily obfuscated, contains text related to 'Barbie doll wallpaper image' and the wkhtmltopdf application, suggesting a lure to potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=barbie+doll+wallpaper+image
    • http://tusededa.jayrographics.com/uploads/1/3/0/7/130739579/81e6900d302445.pdf
    • http://mixizigap.saltlakefencecompany.com/uploads/1/3/2/6/132695351/zobolofidifa_ruredefirik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/melivenagav.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/foritig.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/xewofupajotunokefizuzal.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/7079890992.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/63736511579.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0793/files/gusilanonapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8428/files/supply_chain_risk_management_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/short_haggadah.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_off00005035.bin
ba74edb24f76e825c42a69ac60c18484a6bf466e3ca6ac6df48445b1b96c7520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5035 5380 bytes
font_01_sfnt_off0000627a.bin
b574f2678e820b14797955a7ddf3b30c9dfcf425d3b20fc91f0a57d95be308d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627A 9788 bytes

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