Malicious PDF — malware analysis report

Static analysis result for SHA-256 11307da4df5d99f4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-02 23:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334ed6148af4b43f4ab760826da1f313 SHA-1: e7f299a3c830c2abfaeb5b1ef867d7c88623188f SHA-256: 11307da4df5d99f43ec2f264c3b0df5935c0f82c73a332fa12b593f2f9c6176c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.cc/pify?keyword=sans+discord+emoji', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of numerous links suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.cc/pify?keyword=sans+discord+emoji
    • http://files.fumcrutherfordton.org/uploads/1/3/2/6/132695663/kozesekonib_wikuko_xazitodugifilog.pdf
    • http://files.lowflying.net/uploads/1/3/1/3/131378990/4954720.pdf
    • http://files.1776totyranny.com/uploads/1/3/1/0/131069886/nedobaxifigogo.pdf
    • http://files.lllsussex.org.uk/uploads/1/3/0/8/130813782/warekekuzafik_dikoziwagok_pekunekasevil_jebisomaresiwod.pdf
    • http://files.thebronxlgbtexpo.com/uploads/1/3/1/4/131437680/nefafekurofifi-nivoje-fopamede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/bl2_storm_front.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/35526205257.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/56135489724.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/rekevokarokojirerigozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/86912177576.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/wotixiwekevukukove.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/vazetakufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/79677848971.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/kelufunaxatisalim.pdf
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/pufibogigaguzibemok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/pijigar.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/vowedokixin.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_off00005ed1.bin
b2ba245c42c4afb81e7768a33f6bbfc24f95b0a03d014547a8129819ead9dab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED1 5232 bytes
font_01_sfnt_off00007080.bin
a090ab55424ef26e319ba383272a7852cc9964d1255a70c3a12d2164ae915a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7080 10120 bytes

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