Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d53b6985697040…

MALICIOUS

PDF

42.9 KB Created: 2020-08-16 17:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db7f69081eb843d3c7cefc055cc53e9 SHA-1: fd1369ac14c551b6955a3a0808f4b018fbe0cf97 SHA-256: 92d53b698569704023bac79fd5ffde6c899355b481ac50cc7dcda3db53f65c07
152 Risk Score

Malware Insights

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

The PDF contains a deceptive document body masquerading as 'Mastering biology chapter 5 quiz answers' to entice users. It embeds numerous links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.cc/pify?keyword=mastering+biology+chapter+5+quiz+answers'. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution. 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.cc/pify?keyword=mastering+biology+chapter+5+quiz+answers
    • http://files.terijohnson.org/uploads/1/3/0/8/130873921/af344.pdf
    • http://files.disneylandparisforgrownups.com/uploads/1/3/1/6/131637224/dce4b5f903.pdf
    • http://dofed.thecarriere.com/uploads/1/3/0/7/130739290/kurozudim_bigomigutaso.pdf
    • http://sezuduju.jtkimmusic.com/uploads/1/3/1/3/131383483/gemep-timos-gafawadovuvedur.pdf
    • http://files.deboabjj.com/uploads/1/3/1/4/131454620/95c1310f1ef8ad.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/underwear_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/jezuva.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/kitud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/xuregubiwetigamorudigaw.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/62227574738.pdf
    • https://cdn.shopify.com/s/files/1/0437/1431/4405/files/runulem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/17970331614.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/lineneluragefolikupumi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/fozarowok.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2254/files/center_tap_transformer_in_orcad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/jiguwobutoliso.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_off00005ad8.bin
9fb32014e3d2a744c28de7f3b7b32f09facc9da6053ea34e4324763b3e6b9c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD8 5716 bytes
font_01_sfnt_off00006e60.bin
29c80f95ea6ff0223f41986db15824c816317ff1e1fe9da18710008d63b42efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E60 9836 bytes
font_02_sfnt_off00008fff.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFF 4324 bytes

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