Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd6c9dca88c9f4e…

MALICIOUS

PDF

45.1 KB Created: 2020-08-22 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b4cd897ce5f832e1403740a71ab407 SHA-1: e11fdf21e727ec266e6b90860b6d9daeb2061809 SHA-256: efd6c9dca88c9f4e844bc9a4e0b7cdb5a9b1c435833d47e07a2da71a01ade388
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with heuristics indicating a 'PDF link farm' and a 'malicious redirector link'. One of the embedded URLs, 'https://ttraff.com/pify?keyword=cara++beetalk+versi+baru', is flagged as malicious. The document body contains garbled text but also includes the same malicious URL and several benign-looking Shopify URLs, suggesting a lure or content stuffing to mask the malicious intent. The primary attack pattern appears to be the distribution of malicious links within a PDF document, potentially for SEO manipulation or to redirect users to harmful sites.

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/pify?keyword=cara++beetalk+versi+baru
    • http://files.patriotspointsciencespotlight.com/uploads/1/3/1/3/131380480/3937bad77.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/70977662141.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/rezidanobupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/rakonut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/22480616545.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/accumulator_in_hydraulics.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/8343111550.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/60156334254.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/nuzat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8264/4642/files/xipivor.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/balojanegusapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/pekerjaan_tidak_beruniform.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/90381810273.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_off000071ed.bin
2ebc834f63d69a49e61faf4433ee354d91bef33f3d9d1d4d711bb028e22de818
pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 4848 bytes
font_01_sfnt_off00008283.bin
47841ac127a7c5cdf078914febc9b486e5a9907da02ba3b9ccd7c01ada54e348
pdf-font-stream PDF embedded font (sfnt) at offset 0x8283 10960 bytes