Malicious PDF — malware analysis report

Static analysis result for SHA-256 821c7d381af6bb98…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 18:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e027739b35d3dedb980606aff6fd064a SHA-1: 24e7dd107f9c2bfbee58593cdd9105b51c882f0c SHA-256: 821c7d381af6bb9896ed23f757576e86e21e82354662f50a5fa88a0a70653c06
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector, ttraff.com. The document also includes a large number of embedded links, many of which point to benign PDF files, suggesting a potential SEO link farm or obfuscation technique. The primary malicious indicator is the redirector URL, which is likely used to funnel users to a malicious destination.

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.com/wix?keyword=o+que+mede+cada+subteste+do+wisc+iv
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/912de2_a4a1e121de4f457b8088f118f2dc3be2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0498c0ee08044bf8bb70d73c57a1bc4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_21cd1a1bc45d4a549ae9719109255894.pdf
    • https://cdn.shopify.com/s/files/1/0444/6447/2231/files/le_bilinguisme_dfinition.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/vuxibafikolopovazexos.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/purple_place_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/20296967370.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/63919413166.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/kijemutukebif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/29317587265.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/math_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0431/7999/9383/files/45455820919.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/fosiwipesakefopame.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/71681087343.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/73654889279.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_off0000491a.bin
adc663936cc4615d203682fd531b6ea1ffb18ce825915252a56c6bb745c16bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x491A 5400 bytes
font_01_sfnt_off00005b73.bin
f2812bc2d66d6a8b81ff0408b41233088d6c89c866fb28fbf4197d91bc7ec8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B73 11324 bytes