Malicious PDF — malware analysis report

Static analysis result for SHA-256 07afcbb9c59811db…

MALICIOUS

PDF

62.6 KB Created: 2020-08-04 23:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 827110d63eee1d2462547b2ce06a4305 SHA-1: 70f7c6105ad40a0c2366a03397ca0a07da8a4bcc SHA-256: 07afcbb9c59811db65c48a8f8464c45d15615b74d9e39c90a99090e93c4dcdcf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, with a primary redirector URL identified as malicious. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a malicious redirector and a link farm. Although no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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=tipos+de+materiales+compuestos+pdf
    • http://files.bxsci83yearbook.org/uploads/1/3/0/9/130969478/6794001.pdf
    • http://files.heart2heartfs.org/uploads/1/3/1/8/131857305/5666517.pdf
    • http://files.soniceliteolympia.com/uploads/1/3/2/3/132303339/disanexudi.pdf
    • http://files.paxtonchapelchurch.com/uploads/1/3/0/7/130775959/lezokif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/4385268972.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/diwerirelazizimapuxubavox.pdf
    • https://cdn.shopify.com/s/files/1/0429/1136/7331/files/sticky_bomb_risk_of_rain_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/4575258380.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/a_black_mass_amiri_baraka.pdf
    • https://cdn.shopify.com/s/files/1/0430/2870/9539/files/bilulevepesijidimas.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/60418653162.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/sesomebaxaxuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/72977871480.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/91610085653.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0431/0027/4845/files/86929313783.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_off0000b3c3.bin
44c3606b9e33cf1d4cd08926464ff11f4106372fbe585c4bb6542f694e23f187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 5248 bytes
font_01_sfnt_off0000c580.bin
5ebeedbcd7b9bb433741d0e8973886bfb422cd766bf2d675865a0c70b67d64f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 11560 bytes

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