Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8609f25d831181c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 04:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303b6a1881a40ec71f27f9ae69be4b64 SHA-1: ee11111f6bcdaed287d4be58a6b75a59db87f617 SHA-256: e8609f25d831181c050cd59f81777a1e19d9bac9b337e7f953ec91cf7d414168
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=ingresarios%20pdf%20descargar%20gratis'. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure to click on malicious links. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=ingresarios%20pdf%20descargar%20gratis
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • http://files.bigbrowndogflorals.com/uploads/1/3/2/6/132695387/jesegoxugavudunab.pdf
    • http://jolas.jarrodhoughton.com/uploads/1/3/0/8/130874633/4245817.pdf
    • http://files.pheasantruncavaliers.com/uploads/1/3/0/7/130775432/rematonanabifoxi.pdf
    • http://files.ruthsartstudio.com/uploads/1/3/2/6/132695734/7158718.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/fufizezasanivenalape.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/risunoxanulafid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0689/3985/files/1_2_3_n.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/18486528826.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/automobile_new_technology.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/javascript_harlem_shake.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/44401550624.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/wijutibafana.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/ladagisaminidananupuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/instrucciones_de_amenemope.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/gat_analogies.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.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_off000060ab.bin
5b0889997474ddffb6ccf892a41deab550dd24522f1af5773baa38869e70c697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 5228 bytes
font_01_sfnt_off0000728a.bin
16a09de7b3a72e1a97b5cf266aa056a6607ef1d259ec183bb29ce290e756b14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 10324 bytes

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