Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b133d59b3403ad…

MALICIOUS

PDF

53.4 KB Created: 2020-08-05 17:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f9f37047d65bc6f5be582a469d2923 SHA-1: 51bf898c821dcf66140e0f4b01b3e6335ca5ab7b SHA-256: a1b133d59b3403ad00fb561a660c3e9f3e64627b654244ad81faed7cfa9e5d52
152 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which point to a link farm designed to appear as legitimate educational resources. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though malformed, contains text related to calculus problems, likely serving as a lure to encourage users to click the embedded malicious 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/pify?keyword=challenging+calculus+problems+with+solutions+pdf
    • http://files.hrhn.org/uploads/1/3/0/8/130813851/wilipijulezokox_wolebazame_tukogonugi.pdf
    • http://files.thecrazycakery.com/uploads/1/3/0/9/130969433/41f32b06cfb842e.pdf
    • http://files.centralflhomeeducationservices.com/uploads/1/3/1/1/131163897/todivovu-novudawepoj.pdf
    • http://files.solutionslocker.com/uploads/1/3/0/8/130815014/xitufamavit-lusuvuxifon.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/af_1297.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/lugovex.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/6th_grade_spelling_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/an_occurrence_at_owl_creek_bridge_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/63272648011.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/bixavelobumugageteb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/livapolegejopexugug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/16893313456.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/nudugabojijavatepupax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/83264027966.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3222/files/luwenavixisulaxuvasiled.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_off00007d36.bin
5a9291422eee248e4461be2bfc839afb396c1045f9e1f64e3f3afab371155479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D36 5708 bytes
font_01_sfnt_off0000907a.bin
ef22ab7e048da8559fe613aeccabe065e735c7a9d49adebe9dc353434eb66d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x907A 10096 bytes
font_02_sfnt_off0000b343.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB343 16144 bytes

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