Malicious PDF — malware analysis report

Static analysis result for SHA-256 4669215854baaa44…

MALICIOUS

PDF

46.5 KB Created: 2020-08-09 04:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd2c9d4b7b99b8a31c4cc39fc33f4c2f SHA-1: 18badcac21b68022af48773fc47b02b9fc7148b4 SHA-256: 4669215854baaa44881ced871e552228880ff3835005e665a861da63e58c919e
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though corrupted, contains text suggesting a lure for 'behavioural based interview questions and answers pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are hosted on Shopify, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=behavioural+based+interview+questions+and+answers+pdf
    • http://files.carolinepaltinphd.com/uploads/1/3/0/8/130814644/510615.pdf
    • http://files.maryshelpers.com/uploads/1/3/1/4/131406669/fanip.pdf
    • http://files.tracyhansencoaching.com/uploads/1/3/0/9/130969115/d78bdfd3e53.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/voladitogetusadixonumurup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/nivetojanafabajukonapujux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/95673468670.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/44497375202.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/warhammer_40k_tyranid_codex_8th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7846/6201/files/paxatokow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9351/4645/files/entre_amis_6th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/genusovubede.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/19803254500.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/calaveras_mexicanas_para_colorear.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_off0000775a.bin
8c9e7362affaa47af8559c5ec04e7902ae4f4408ad1b7c19f42aab2910ff28a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775A 5596 bytes
font_01_sfnt_off00008a69.bin
064e0650ab0f279bdfc05506135b6d66203f397b2cb02d0dc583b95e0e58e19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A69 10120 bytes

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