Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac02066486c83d6d…

MALICIOUS

PDF

35.7 KB Created: 2020-08-03 16:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb4e695952b51ba339835d606059627 SHA-1: dc59b169109464fb25a43cb73cb5942275e6d843 SHA-256: ac02066486c83d6dd2b46e2da2d7c198a2a7d6704f74abda0b3842e159eeebec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `https://ttraff.ru/pify?keyword=analytical+questions+for+nts+test+pdf`. This suggests a phishing or scam attempt, using the guise of "analytical questions for nts test pdf" to trick users into visiting the malicious URL. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=analytical+questions+for+nts+test+pdf
    • http://files.katascuba.com/uploads/1/3/1/8/131856257/4282653.pdf
    • http://files.mushinmovement.com/uploads/1/3/2/6/132695531/doxelofajofos_nejilosoz_lapenowubop.pdf
    • http://gowejo.johnsonvilleheritagefestival.com/uploads/1/3/0/7/130740141/bixipava.pdf
    • http://files.monaconsulting.com/uploads/1/3/1/4/131437443/gunamodusisimox-nibarexebuf.pdf
    • http://files.htecauto.com.au/uploads/1/3/0/8/130873851/8718362.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/44024857927.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/9218441397.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/xarulexag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/bujerugenewunesunoba.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/katedewiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4225/8587/files/fiwutebaluxuvifoxefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/33015438883.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/55773575909.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/nevaxiduxunesarirewi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/cub_cadet_xt1_46_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/32148943841.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/wusetapepev.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_off00004b65.bin
b7a216299ca19efdbef6f8915d76f32e1e82999fad0e29bf9fb00095679f504d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B65 5368 bytes
font_01_sfnt_off00005dc2.bin
242ac498e565096e16d6760f30ffa64274ef51990c4a3f887ebe0f1b55dfd63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC2 10600 bytes

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