Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9847365405c211…

MALICIOUS

PDF

43.3 KB Created: 2020-08-13 00:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d77ce3dda92410bd33d10b53b7d568e SHA-1: 2826dba122df441eded8ea638de9c760ed119a99 SHA-256: 7a9847365405c21176ebde2bee20e3dc4485566637d49310061b9500539c7e09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to PDF manipulation tools, but its primary function appears to be SEO link farming, directing users to numerous external URLs. One of these URLs, 'https://ttraff.com/pify?keyword=pdf+split+and+merge+mac+os+x', is flagged as a malicious redirector, indicating a likely attempt to lead users to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

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=pdf+split+and+merge+mac+os+x
    • http://files.websteradventure.org/uploads/1/3/1/3/131398140/lodokolijugu_xosozokawonax_kibijogaxozutuk.pdf
    • http://files.5809yoga.com/uploads/1/3/2/7/132712139/kirisure.pdf
    • http://vonusa.finebagels.com/uploads/1/3/1/4/131408280/4025582.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/biblical_understanding_of_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/dezosebobugi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/life_cycle_of_a_flowering_plant.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/86308896499.pdf
    • https://cdn.shopify.com/s/files/1/0430/1435/7151/files/fundamentos_da_agricultura_biodinmica.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/ginidelinotax.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/wadasigovusunafor.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/38205952662.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/linifizefe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/refokabaviwara.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/timefupoveligafijag.pdf
    • https://cdn.shopify.com/s/files/1/0429/2549/0332/files/43987668005.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/twic_card_application_forms.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699f.bin
bee41edfa20e9f734a7908bc9f916e55d59265da1d8929f001c76030d526b56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 5544 bytes
font_01_sfnt_off00007c63.bin
ff689ee65c5e8e91f98b6c61aab3720f39e7689458d7bf970517a067213ba6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C63 10544 bytes

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