Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c208ff5cab4481…

MALICIOUS

PDF

46.9 KB Created: 2020-08-04 05:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8e08ab45808016152681e9142ff96b SHA-1: 2b63a0ef23285e39e35c33c63f9e5715ffeb0352 SHA-256: c5c208ff5cab448145421ea08a4a4834fd3f060bc079254990f5bb6cf0e0c4e3
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as "Astm testing standards pdf". The primary heuristic indicates this PDF links to known malicious redirector infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL suggests the intent is to lead the user to a compromised site.

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=astm+testing+standards+pdf
    • http://files.highpeaksadventureco.com/uploads/1/3/2/3/132303170/6cab8284.pdf
    • http://files.whittonprecision.com/uploads/1/3/1/4/131438616/bfc001edcec7.pdf
    • http://files.moesplace.us/uploads/1/3/0/7/130738875/zutizak-wikuriku.pdf
    • http://files.bonafidesp.co.uk/uploads/1/3/2/6/132680994/raminukozobuwug_vawuforagini_tuketupomifag.pdf
    • http://files.bradlycurriemsf.com/uploads/1/3/0/9/130969004/fefexeda_gasakorut_jufipedino_sewazonuti.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/17268776152.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/perigukujekubonomij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/xevukesirobetebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/academic_coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0433/5065/5129/files/katedupepeligizamerafoloz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1877/files/duxazevapibilusidider.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/sudowuborawugeda.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/wugarile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/63514721252.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/danakajuborigoxabisa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/lotro_anniversary_scavenger_hunt.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c23.bin
0de3de16671dcc51a965692f0d5cb3f344346e12549829dbbaeffc6bab4066d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 4996 bytes
font_01_sfnt_off00007cfa.bin
890065868dd70c8272093ca5b04e7523a11fcf67ddb09f5b7d758823413ce79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFA 10504 bytes
font_02_sfnt_off0000a047.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA047 4324 bytes

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