Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ddecb1dbf48ea9…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 18:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2997df11a8fc9bf0abcf6e11cb7ff2 SHA-1: f365d9ba09d5f1f745fae3e3d1b6f3a91313f699 SHA-256: f4ddecb1dbf48ea985e441a0c6445a6fd1e59d8ece529e06ffdd83eb260753c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=avery+template+5366+dimensions'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=avery+template+5366+dimensions
    • https://static.usrfiles.com/ugd/735189_9aeff3676fcb432993fe18bd18789110.pdf
    • https://static.usrfiles.com/ugd/b8c837_916e44f6fad5480fa1539ac33117e80c.pdf
    • https://static.usrfiles.com/ugd/bf650e_84108b068ce84659bf6a2220d7898de8.pdf
    • https://cdn.shopify.com/s/files/1/0432/1158/7752/files/kovobutop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3168/files/xaguxupovuz.pdf
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/bazewodaregivaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/65242704659.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/nupaxejili.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
    • https://cdn.shopify.com/s/files/1/0434/3690/0504/files/97868217093.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/kaxakukefujufabidedusaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/7776299891.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_off0000465e.bin
4dca706c5a9bc7258b6ca1c8100261c9f318e63fcacfe334d10ef7450b97c9e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x465E 5488 bytes
font_01_sfnt_off000058f1.bin
56c5d038a4c6ab9c8faec7de109f06a915f6a0e6597f2d0bb81007188dcb854d
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F1 9956 bytes
font_02_sfnt_off00007b17.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 4324 bytes