Malicious PDF — malware analysis report

Static analysis result for SHA-256 618b4905a465d87e…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 16:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a3ea60fcfbea081f9c8e0db663d4922 SHA-1: 0983e8bfb12af2df0017dc16637d7ab5516aa7f4 SHA-256: 618b4905a465d87e59aa32eb5a245cfcbcbe37509966e8de4abe7bfca05c39ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further suggests malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious infrastructure.

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/wix?keyword=action+verbs+images+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/625844_95da6ab20c7d4afc932d760968c72161.pdf
    • https://static.usrfiles.com/ugd/b8c837_23fd4484a92a4616b0e93462d91a9c37.pdf
    • https://static.usrfiles.com/ugd/704566_9ef4a822e87543adbd7cc0cadddb034c.pdf
    • https://static.usrfiles.com/ugd/2274a7_f979971b29ad4b1d841cea32e53656df.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7706/files/guitar_chord_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/zixebamezudipukazaweluwet.pdf
    • https://cdn.shopify.com/s/files/1/0436/6050/9337/files/45759691750.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/the_book_of_the_courtier_baldassare_castiglione.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/blackberry_picking_poem.pdf
    • https://cdn.shopify.com/s/files/1/0436/3619/5488/files/pogeniwatatozufo.pdf
    • https://static.usrfiles.com/ugd/b8c837_165fb73706fe412c814ff61381b9a175.pdf
    • https://static.usrfiles.com/ugd/221f3a_9e8f8ead8ee047bdad974a0f6178ab0d.pdf
    • https://static.usrfiles.com/ugd/a59130_5324d1f918a94c97b8a3599783ccb9ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_63cfe6ccbf0f42599e0f28bc976ac1af.pdf
    • https://static.usrfiles.com/ugd/b8c837_1184f9f3fe86435aa291defcad351a0d.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_off000056ba.bin
43d5f0477e2cfde16bee58c6a6990244ea51f9f6d505b235ea09a89aa973695b
pdf-font-stream PDF embedded font (sfnt) at offset 0x56BA 5632 bytes
font_01_sfnt_off000069be.bin
2d323a60d659063b2d24b4431fd57faac461e351de2b1febdc536a6fa1823d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 10268 bytes