Malicious PDF — malware analysis report

Static analysis result for SHA-256 8121c02ffd304323…

MALICIOUS

PDF

35.9 KB Created: 2020-08-23 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b13828d01528a887378adc3c002dae2 SHA-1: ad2dff3c51a93dc465d09c497af92b280797d15a SHA-256: 8121c02ffd30432361ad33e89a85d32809d26110c14131face64e8b11ef77ae7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files, many of which are algorithmically generated and hosted on potentially compromised domains, suggesting a link farm or SEO poisoning attack. One critical heuristic identified a link to known malicious redirector infrastructure, which likely serves as a gateway to further malicious content. The document body, though partially corrupted, contains text related to 'Glencoe health answer key chapter 3' and includes the malicious redirector URL, indicating a lure to download further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=glencoe+health+answer+key+chapter+3
    • http://files.sailingwildhorses.com/uploads/1/3/1/3/131398598/lepogi-tebonajagabuvet-xatosevepidoji-kafadomonubu.pdf
    • http://wutujita.owl-valley.co.uk/uploads/1/3/1/1/131164250/9229622.pdf
    • http://luwexexog.saloneco.net/uploads/1/3/0/7/130739892/bijojafotiwujozuripi.pdf
    • http://files.carriagehousepilatesandwellness.com/uploads/1/3/0/7/130740141/mobogadozonijavudinu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/the_bundle_of_sticks_story.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/dibakew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/famezewabiweb.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9168/files/equidad_de_genero_en_el_peru.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/75228151095.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/94417907390.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/kexotibizuguluwix.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/5314933368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.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_off00004f8b.bin
59f0e190187aa7c2770381cf4d64fe9b2eddfa633aff6b8749160cfc82f507e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8B 5472 bytes
font_01_sfnt_off00006238.bin
31dfe6de2edbddff7264fa71ac6c15918f954ed61835b011a56a284abe09879e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6238 9564 bytes

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