Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cfda409f22eab7…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 16:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbacbf8796e9aca04014662ca7262609 SHA-1: 5feec1e35fcfba3cf5ff24657ab082850a4fa430 SHA-256: e5cfda409f22eab7dc808ae69aef944e1571168befa09fcd45e7d545e1dc5248
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector service. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic suggest the primary goal is to redirect users to malicious content, likely for SEO poisoning or phishing.

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/wix?keyword=aatagadu+songs+free
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/zafibewufexixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/vizonosabedux.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/fonikiba.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0e9fdcae2349c7a7723f529029c282.pdf
    • https://static.usrfiles.com/ugd/ae059d_05adf3b641944154825ed6f98736598d.pdf
    • https://static.usrfiles.com/ugd/822ecd_bf869c3597f24773a2b59b5c33a8f2f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_271cbeca9dab4340b6fc9ed23a2e7d22.pdf
    • https://static.usrfiles.com/ugd/6d59ab_e87c108ed9ab41a99dcb0370d01390d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d14305228349b79a9fa88ff53bf428.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_48e36cbea1e3485787b4b44869a30e54.pdf
    • https://static.usrfiles.com/ugd/0d089b_9fc0b3cf054f48918b89913b52584bde.pdf
    • https://static.usrfiles.com/ugd/81d6a4_cb2101aac38d4612985f698631051b40.pdf
    • https://static.usrfiles.com/ugd/0cd019_21e8702824b4419183f1ea2f47c72aa5.pdf
    • https://static.usrfiles.com/ugd/f967ac_1bf3977b23a844a7a554476f9a98e1b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.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_off00005c9b.bin
e37c7425ad54fb6da6b24c718f418730f24d8b27b6e27b075b4812fb720eb188
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9B 5032 bytes
font_01_sfnt_off00006dcd.bin
1407802600be05fe4552136bd0c8929579f67df19a629d25543b10ff3908b146
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCD 12612 bytes