Malicious PDF — malware analysis report

Static analysis result for SHA-256 0559245ad1c72129…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 01:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5de452a1ad1ccb5f85ac5b266cd3b2a3 SHA-1: c2bb20f3c1767337de5a78fc622c8021499648e2 SHA-256: 0559245ad1c721290b4d5bb77b5d4c93abf9a528b679695320c57b521437d7f3
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a phishing or scam attempt, likely leading to malware download via the redirector.

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.cc/wix?keyword=camscanner+license+apk+apkpure
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7e0eb0_8276afcfa8384b7d8153dbba395545a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a560164ed24750b3b965e884e7aac6.pdf
    • https://static.usrfiles.com/ugd/912de2_e66fe03bb48742449750f7423d063efb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7807bcadfb849dea0642997cd7616ff.pdf
    • https://static.usrfiles.com/ugd/f103bb_74eb899602a54bd9b6d03ee343f0cf69.pdf
    • https://static.usrfiles.com/ugd/b8c837_11e581ef13624aa7a70b29450cc945d2.pdf
    • https://static.usrfiles.com/ugd/55cc32_8af76ba5ba7641b3b398459050831f44.pdf
    • https://static.usrfiles.com/ugd/b5472a_5e7f0b33a2254217a72f01fce6a27da9.pdf
    • https://static.usrfiles.com/ugd/b8c837_52612a50485548a5aecd898dc5b1ef55.pdf
    • https://static.usrfiles.com/ugd/b8c837_eecf3555d2324c12a924b07dbb9659c8.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/18656357674.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/pisajexarasaz.pdf
    • https://cdn.shopify.com/s/files/1/0451/7701/2373/files/29610798722.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_off00005c13.bin
06e8d3589e791cdddda1cf558f59b6c9b98a424091a92d1ef51157bbdff398c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C13 3172 bytes
font_01_sfnt_off0000678f.bin
ddb32ff049aa03883dd8ce720f6aca5cd4ae698ed2f0ff7ffc3d0b5e70b477e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678F 5048 bytes
font_02_sfnt_off000078a0.bin
00ead7a4ac6a09b3f992e1b52a19a6841685ceffa36db181e7e3ad192ed3e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 14000 bytes

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