Malicious PDF — malware analysis report

Static analysis result for SHA-256 673641ebcb724b69…

MALICIOUS

PDF

48.3 KB Created: 2020-08-14 19:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889ce8584106932c2458d4236c345cee SHA-1: 98168b4a4217f1241a589ad7bd39fb2567d4eb01 SHA-256: 673641ebcb724b69b068ffeac1e67053da13b4a6fc64b3a398f44fa343b43ae6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=best+monthly+budget+excel+spreadsheet`. This indicates an attempt to redirect users to potentially harmful content under the guise of providing useful resources.

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=best+monthly+budget+excel+spreadsheet
    • http://files.samsaraholidayhouse.com/uploads/1/3/2/6/132681901/givijuwowekiga_xatozalizo_senubolubo_sijiniwefikav.pdf
    • http://files.eurekarestoration.org/uploads/1/3/1/4/131407469/logisazis.pdf
    • http://files.mosaicsyourway.com/uploads/1/3/1/8/131871535/297367.pdf
    • http://files.mammioux.org/uploads/1/3/1/4/131438142/welemubo-zovitekibalixa-kizoburasogeted.pdf
    • http://files.merrymerrymarketgso.com/uploads/1/3/1/4/131437532/9108945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3237/0590/files/volume_of_prisms_and_cylinders_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/62236924677.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6241/files/cancer_de_mama_2020_oms.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/59333954525.pdf
    • https://cdn.shopify.com/s/files/1/0432/3118/3016/files/ableton_live_suite_9_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/27749250731.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/55219475893.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/4006/files/que_es_el_balance_de_materia.pdf
    • https://cdn.shopify.com/s/files/1/0451/0410/3576/files/mosozun.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/1168371075.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/87061591774.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_off00007c36.bin
ae623156fb65c488b74acac94773f7254bab18d489dbd50ad17730449f6c4a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C36 5844 bytes
font_01_sfnt_off00008ff0.bin
9dec72a4dcae6c6843fadcb0e96f9c8df9fdf6e66dbc1a2a8cef1d1aca7fd061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF0 10660 bytes

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