Malicious PDF — malware analysis report

Static analysis result for SHA-256 770dc1cecad124d6…

MALICIOUS

PDF

32.1 KB Created: 2020-08-15 17:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 437883dd6473c33e77a78feb974145ff SHA-1: b3f045290f36cf29c64497f74eadda698474a788 SHA-256: 770dc1cecad124d6403a362a30fc054a4208b27910ea23ac74f01ce5cb862e56
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as academic resources, but the primary link redirects to a malicious redirector. This suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. 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.cc/wb?keyword=matlab%20for%20engineers%203rd%20edition%20solutions%20pdf
    • http://files.johncheck1.com/uploads/1/3/2/7/132710592/2541779.pdf
    • http://files.shimsfitness.com/uploads/1/3/0/7/130776573/8096470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/9290/6918/files/60173794455.pdf
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/mizuvexibosilisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/relobonutesalosag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/99124884711.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/list_of_common_idioms_and_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/gepapajotesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/american_english_file_3_2nd_edition_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/arabian_nights_stories.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/mosib.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_off00004122.bin
a6d19b8d9641e9219250706091f4551cb32071a1aa4b098db0380930be228a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4122 5520 bytes
font_01_sfnt_off000053f1.bin
a3b21a5927b4f7979a2fefd2f56341ca3f655a6bfcf87bd462ccfa6e9d66032f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F1 9340 bytes

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