Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc87b43983250d…

MALICIOUS

PDF

51.9 KB Created: 2020-08-09 20:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28442fe5da45d5c012cd4159ad1e60c1 SHA-1: 06a1e37eb67b0e05aed57e8ef6d052a5b858b69c SHA-256: dadc87b43983250d87c9bb99bdade134e25776b14008601e2ae9f2ca136003bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to other PDF files hosted on Shopify, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. One of the embedded links points to a known malicious redirector. 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.ru/pify?keyword=how+to+decalcify+pineal+gland+pdf
    • http://files.mnwelcomehomevets.org/uploads/1/3/1/8/131856173/495aa981b043.pdf
    • http://files.lccsmusic.org/uploads/1/3/1/6/131606546/c60751eb6c1664f.pdf
    • http://mazawugid.giftsrwanda.org/uploads/1/3/1/0/131069839/fafanemimakurika.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/sakufupavimemapaxoware.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/assistant_project_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/21704149642.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9522/files/sixixemobiviregavefegomaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/31027763612.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/vutubo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/jobatujojidoketurezi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/absorbance_spectrophotometer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/rawogijajol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6996/4439/files/op_amp_circuit_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6473/files/92203663744.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/vistaprint_business_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/simple_business_plan_for_students.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ffc.bin
aef50aa961f58c7055ebafbb3c6f33577f15b491362b032c596b7e13bf08da2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFC 4992 bytes
font_01_sfnt_off0000911f.bin
310b3c0c50e9e7d35d81db2f711261c8059cf617ff4c4eb7e5e979b370d3f579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911F 10364 bytes
font_02_sfnt_off0000b49a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 4324 bytes

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