Malicious PDF — malware analysis report

Static analysis result for SHA-256 761585609b163fab…

MALICIOUS

PDF

41.9 KB Created: 2020-08-05 01:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d98b70959ef5ac97ec5d2542f45e4a9 SHA-1: 342a7b1e8349f567651347846e4d969c1f9c4f2b SHA-256: 761585609b163fabdfb697b1cbc15aab8db3514b5c599ef6e83f82212f8a935a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of an SEO spam campaign designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=data+structures+and+algorithms+in+java+pdf+goodrich
    • http://files.msminasbodycare.com/uploads/1/3/0/7/130775320/velilixebetebuz_jusutugo_lobinodikopituz.pdf
    • http://files.marwanhaddad.com/uploads/1/3/0/9/130969377/cf68f.pdf
    • http://files.psy-chick.com/uploads/1/3/0/7/130739646/moniwebinu_bitinitiz_tafin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1945/2072/files/5612330520.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/rapid.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/jaxilapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/85506427410.pdf
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/underworld_rise_of_the_lycans_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/bsc_first_year_botany_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/john_deere_320_skid_steer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/netaxejitomaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/33494764294.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/housing_benefit_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/94926520149.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/tesaxotup.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1283/files/king_cannoli_and_the_unholy_ravioli.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/98207870960.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006428.bin
9733e386f549df33e5f4be3d582baf49a22e19d4d0820d904453eb19ae141ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 5704 bytes
font_01_sfnt_off0000777d.bin
ba7d44942fbcd25bdb15b5fb4a596205cec79ccaec115020efed8af0c19caf9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 10288 bytes

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