Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf3105707c412bf…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 16:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb72b933c2cbdab0c8a7b7b3b9506fd7 SHA-1: a498b136b173d2fc4e4889ef06edc2a01427e3b0 SHA-256: 5cf3105707c412bf0ad7fa5f4b127c22cd23329b9ea168f10659f915a1809c39
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a "free download" that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure to download content, which is then redirected to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=free+download+wood+duck
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/1057/7816/files/17680781897.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/aditya_hrudayam_stotram_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/crimson_peak_movie_in_tamil.pdf
    • https://static.usrfiles.com/ugd/58a813_4d1016b3d6c049daa33f6e78292f4ecf.pdf
    • https://static.usrfiles.com/ugd/405339_76740b0a07b147aa924df9ec97256d38.pdf
    • https://static.usrfiles.com/ugd/cafc24_b4ace4769c944fa0873b0fd707932412.pdf
    • https://static.usrfiles.com/ugd/65b209_d61de1331f6a4dcfafa5db713bc0f364.pdf
    • https://cdn.shopify.com/s/files/1/0454/2965/3660/files/turuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1770/7413/files/alienware_17_r4_specs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/69514226228.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/lexikawog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/44667093681.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/zifexeju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ba8.bin
3dab436abeaca359cacf349e690916ba445ad82c902e95785dac6504801e1681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA8 4620 bytes
font_01_sfnt_off00005b71.bin
7cfacff4f8b35ee6e5786e7c23af591164f8158d4ab9819e7dd59f64f49a572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B71 10860 bytes
font_02_sfnt_off0000805c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805C 4324 bytes

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