Malicious PDF — malware analysis report

Static analysis result for SHA-256 f456f539b2257fa9…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2e4e38be95228bfc3868d747344641 SHA-1: 6ff727346f71d2bd135e3cdb0e1a1fd8b5d0255e SHA-256: f456f539b2257fa9a4e104722920d105b98c77c2c99105527ae9ee823314bc28
154 Risk Score

Malware Insights

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

The PDF document contains a prominent link disguised as a guide for an Android application. This link, 'https://ttraff.club/wix?keyword=cara+menggunakan+apk+4g+lte+signal+booster', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many of which are hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.club/wix?keyword=cara+menggunakan+apk+4g+lte+signal+booster
    • https://static.usrfiles.com/ugd/2b3f46_8e116ffa59454f5e921d94445757fd5c.pdf
    • https://static.usrfiles.com/ugd/e3ff21_6aa64b3ad43746de9903233e1a76fde0.pdf
    • https://static.usrfiles.com/ugd/9ea91e_e06850d2f1d84f94b7c709e49c7b203b.pdf
    • https://static.usrfiles.com/ugd/d54300_fc85d7b470504331b28fe16a35e5de8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb0cda1480f47419fa40babc8d9a77b.pdf
    • https://static.usrfiles.com/ugd/44b221_0c09f7941ef24d58bc5af96831d0f3c9.pdf
    • https://static.usrfiles.com/ugd/217d68_06424a1ffd874aa794254f4bb469fec1.pdf
    • https://static.usrfiles.com/ugd/b8c837_354a95618d324d27ae6063bcd34cfe0b.pdf
    • https://static.usrfiles.com/ugd/0aab01_a1f221ad310149ff9f1d290d57570f91.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/60033056784.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/begafapokorovugud.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/aviso_de_privacidad_formato.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/girolumafanav.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_off00006a75.bin
8dad160f06d2bac49f5f991b8c5f17008da30866be2938d64421e564767c6a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A75 5336 bytes
font_01_sfnt_off00007c8e.bin
7b6bcedac2f5cb2678f20acb59faed7750f67216d14b0c0941fd7151621906ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 10348 bytes