Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8be9adc78136b6…

MALICIOUS

PDF

33.9 KB Created: 2020-08-18 16:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257cab11db6c0ae8a084bcb1ed1edca0 SHA-1: 829b72d04bdcaa320f88ed6170f7f68e13080fda SHA-256: fe8be9adc78136b6f977c0b001d5a0187e0a5cbf191b1826c94b52ba0a6971ca
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. These links ultimately redirect to a malicious URL, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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/pify?keyword=second+conditional+exercises+pdf+2+eso
    • http://files.wonderingthrough.com/uploads/1/3/1/6/131637552/adfedacd6fdb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/mujilefanabikemibazedubib.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/lagakovowowevizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/tijeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/saketidarisajovinetax.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/38639382359.pdf
    • https://cdn.shopify.com/s/files/1/0436/7941/6473/files/sonic_psp_games.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/docker_toolbox_windows_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/detailed_structure_of_a_plant_cell.pdf
    • https://cdn.shopify.com/s/files/1/0436/2679/1075/files/69074397421.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/98703170640.pdf
    • https://cdn.shopify.com/s/files/1/0438/1956/5216/files/classic_human_anatomy_valerie_winslow.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_off00004604.bin
3952fb062877b03aec243431b283e64c39bdafdeb72166a05e326cb692d7ed91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4604 5452 bytes
font_01_sfnt_off00005898.bin
d4b82c234ec4723dd3ae9e836a0ec9d6dec8beab5b0f43d220c56cb67c84301c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5898 10024 bytes

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