Malicious PDF — malware analysis report

Static analysis result for SHA-256 8462db99449fa100…

MALICIOUS

PDF

54.6 KB Created: 2020-08-05 03:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5a4025fc9e87d06b22304dcfd494cc4 SHA-1: fc5ae6eeeb0124a7bc8667d54c8b3e5286861608 SHA-256: 8462db99449fa1004d37bbe5673adcb30a0bc4a5ed0436eff8c0057600e952f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'physics practical book pdf' and the malicious URL. This suggests a phishing attempt where the user is tricked into downloading a malicious file by clicking on a link that appears to lead to an academic resource. The ML classifier strongly supports the malicious nature of this PDF.

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=bsc+1st+year+physics+practical+book+pdf
    • http://files.sandislandtennis.com/uploads/1/3/1/4/131453902/tubesefopetodubo.pdf
    • http://files.carringtonandfinch.com/uploads/1/3/0/7/130738928/vojogojadewawiteti.pdf
    • http://files.jaredmathisen.com/uploads/1/3/1/4/131454216/aaa6a9d2.pdf
    • http://files.roxannaalbayati.com/uploads/1/3/1/4/131483209/metowonamev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/44218781742.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/lobegivuzorojogifijifor.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/bazalalevu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/65514987094.pdf
    • http://files.agrawal.people.ua.edu/uploads/1/3/2/6/132683289/rapuxasonamata_kitejewelasaf_fejebolorokomub_supapasivodid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/kujuzup.pdf
    • https://cdn.shopify.com/s/files/1/0440/6935/5670/files/66853334379.pdf
    • https://cdn.shopify.com/s/files/1/0428/7211/1260/files/83290827208.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/33251252298.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/henry_s_law_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/55615290768.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/45767228156.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656a.bin
4d39d9dd218098e986ced2e9581b059501227c0713a50d26aa72be67ed016f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656A 5648 bytes
font_01_sfnt_off000078a8.bin
6eccce38622d4d4b722dbde0495d58de6550d1aa0d38ecaf99973f5005ed093b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 3204 bytes
font_02_sfnt_off00008599.bin
e18682b3fd46480e9666d503c4d562864582807b4e0cbc1ca2988c903de9febe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8599 2320 bytes
font_03_sfnt_off00008feb.bin
cd7a02b9bddd3f74a1773f60e54506cf80bc31d388d387e599d0dfee2708c9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 11584 bytes
font_04_sfnt_off0000b66f.bin
c3f93d69e3cb30c81ae8f35965ac9f1a1a35941069675b7c0fcc3f03c8d11774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 16224 bytes

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