Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee8fec7331e073…

MALICIOUS

PDF

40.0 KB Created: 2020-08-15 23:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f170e43ee2615a31589a3780bea72d2b SHA-1: 50e5693ad1f735e7a130c5ae694c2b5626bc74b1 SHA-256: 9dee8fec7331e0739170651470b33b87a538e74f6f2a70e795786d9fecaa97eb
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/wb?keyword=cpns%20kementerian%20ketenagakerjaan%202019%20pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to this malicious site. The presence of numerous other links, many hosted on `cdn.shopify.com`, indicates a link farm designed to distribute traffic to potentially harmful destinations.

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.ru/wb?keyword=cpns%20kementerian%20ketenagakerjaan%202019%20pdf
    • http://files.sophie-eleanor-photography.com/uploads/1/3/1/3/131379781/9691710.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2283/files/aptitude_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/nexefin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/lakokugeluxiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/zesib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/vavanugokatelujit.pdf
    • https://cdn.shopify.com/s/files/1/0431/3582/8124/files/possessive_adjectives_exercises_1o_eso.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/76489143200.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/fosumutodaxaximefujelib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/64758000455.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/loxusapidafuderazik.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8078/files/40300982333.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/79526509436.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/8706063149.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_off00005daa.bin
d80a8249ea0d70dbe10f44d6fa4afb24211c2d61b5e3efacc3f3c4806d56fe95
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAA 5856 bytes
font_01_sfnt_off0000718c.bin
73327af2614e9de1aa525e8f5fb03128c50b292dae6379ea7ac1429f3f6aac13
pdf-font-stream PDF embedded font (sfnt) at offset 0x718C 9860 bytes