Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e155fc14564995…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 14:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ddfbd8ba4c36aa6744241c7fac8f674 SHA-1: 74b63e9c2bb0471a8e939a27c823c63ab398ba36 SHA-256: 88e155fc14564995a7c0220d2d62ae94d4b2fd042ce37525eb4a519290aa5bb1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to lure users to malicious content.

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=risk+analysis+methods+pdf
    • http://files.greenpiecenursery.com/uploads/1/3/1/3/131383763/25f634d38.pdf
    • http://degabo.kingdommovementglobal.org/uploads/1/3/1/6/131606968/ad6da2df255f.pdf
    • http://files.newleafkineticarts.com/uploads/1/3/0/9/130969061/zozeruratorinexawak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/uppercase_and_lowercase_letters_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0448/3537/3213/files/chalte_chalte_movie_all_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/wivijutafemifubazetas.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/plural_of_irregular_nouns.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/bridges_in_mathematics_grade_5_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/93744533217.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/38586333314.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/83585100248.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6868/files/all_routes_of_drug_administration.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/metal_bending_machine.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/79389453941.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/sonorevofelolewunoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/fuledubap.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_off00006707.bin
678b5de6621c919cb162c3c5e6090650be006f8acc80b29d2149bee4d56d67c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 5360 bytes
font_01_sfnt_off00007923.bin
77d88352688c0d871773bf3736200263d17c103719ab3c4b0be7a2faefa6fcf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 9844 bytes