Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b769f0e3627fa9…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 18:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9cc709d8e3205898c4a70455aa58157 SHA-1: adeb53542ce84bacbe6205a560192325b1c47c65 SHA-256: d3b769f0e3627fa915f20813a76484bb6f75ee78df0af4bd51d5f8dd3132bd82
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a search result for 'hungry shark world apk mod'. This suggests a phishing or scam attempt to lure users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, further supporting the malicious intent.

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=hungry+shark+world+apk+mod
    • https://static.usrfiles.com/ugd/e4ff69_87dd462af3024db5a255b7633060d58f.pdf
    • https://static.usrfiles.com/ugd/a31856_e19f2b2f6b2c4bfa9589e2db783e87ea.pdf
    • https://static.usrfiles.com/ugd/455f95_c84b80f1e3974da587912e176e586e60.pdf
    • https://static.usrfiles.com/ugd/b8c837_68780f2a0bd846f2930ccf35a77f2cf1.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/kopirusalarenanajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3545/9738/files/mupadulutetu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/headway_plus_beginner_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/compendio_do_catecismo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/guitar_chords_for_beginners_acoustic.pdf
    • https://static.usrfiles.com/ugd/d3758e_c6e54640dd86429298885649d21f167f.pdf
    • https://static.usrfiles.com/ugd/544c7e_2f2d8f03f6c2446fa128dde8a850132d.pdf
    • https://static.usrfiles.com/ugd/40512e_bfe6564804c94594a132ba4e93e9d9b6.pdf
    • https://static.usrfiles.com/ugd/4ae4db_c50c5db4561a494d8a50a7346e5b3412.pdf
    • https://static.usrfiles.com/ugd/b8c837_fab259615d8f4c029b38d19872f67ee8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ee.bin
b8d3415727aa02eb554869217aa73e976c81a15e8a015bc2ec019f4a27efed1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5592 bytes
font_01_sfnt_off000077d7.bin
fa71dd0d6bb228185dd2ee49e131b97193530f1b83a2188d7d59890eb5751023
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D7 10260 bytes