Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b47f03b23cecb4…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 20:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2604c81ea9cfea85a89a8a643a72dd SHA-1: 1f22aeabd849b29049cd87b620894c65cc707da3 SHA-256: 98b47f03b23cecb479e5ee5decfcbd985fb3f948f0ca4daf5f387f9736422fb4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious sites via embedded links.

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/wb?keyword=upstream%20b1%20pdf%20vk
    • http://files.horsetrekmongolia.com/uploads/1/3/1/4/131453053/3761080.pdf
    • http://files.stfcfoodnetwork.org/uploads/1/3/0/9/130969735/2af32f037457cd5.pdf
    • http://zudel.hhollisapply.com/uploads/1/3/1/4/131438216/dceef51.pdf
    • http://dedenem.medexnet.nl/uploads/1/3/1/4/131407797/6841593.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/80594265675.pdf
    • https://cdn.shopify.com/s/files/1/0430/1851/8681/files/desukad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/63249329609.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/xaxinutiburigovit.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/maderomemovop.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/12513380661.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/68633093578.pdf
    • https://cdn.shopify.com/s/files/1/0437/8814/0696/files/teleological_ethics_vs_deontological_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/mm_to_gauge_conversion_for_sheet_metal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/58464809047.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0074/files/ignition_timing_advance.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/printable_calendar_monthly.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/budolimumatifozavagaviket.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/autoboxing_in_java.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_off00006108.bin
927578687f613e0ea80c0001cab16b71d59cdffc2af9b428f11f48bd411c95b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6108 5460 bytes
font_01_sfnt_off00007390.bin
a898653855817aa4a7b617b2d9816543fcef8f2334eec1b985f97e2a6b4627eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 15796 bytes

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