Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dffe77a0086e8b7…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 04:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b73c5022d15142f295f0650ece9e028 SHA-1: 78c5fea6d7467df468e3df0c8c81cc5e65e3d4aa SHA-256: 6dffe77a0086e8b7169b0d101989615c974dc46af0c67e6322e8a69737cd972a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of links to external resources, many of which are hosted on Shopify and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to drive traffic to this malicious site. No scripts were extracted from this sample.

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=completing+the+square+problems+with+solutions+pdf
    • http://files.cameronhighlandshomestay.com/uploads/1/3/1/3/131380741/7867893.pdf
    • http://files.octws.ca/uploads/1/3/1/4/131437402/ludisebanu_zidekewegofemu.pdf
    • http://files.g2gdrivingacademy.com/uploads/1/3/1/4/131437318/9642682.pdf
    • http://files.conductorbeverlytaylor.com/uploads/1/3/0/7/130776458/tugabujuduwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3680/1184/files/62828868648.pdf
    • https://cdn.shopify.com/s/files/1/0429/9292/6873/files/thinking_in_java_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/65646007202.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/i_walk_the_line_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xadexuwewipibiduba.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/36947073872.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/natadoxef.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/inorganic_chemistry_notes_for_bsc_3rd_year.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/56164841618.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/padusuwasavivinum.pdf
    • https://cdn.shopify.com/s/files/1/0432/6821/0852/files/rojukejiwuriv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5366/8769/files/pi_in_hex.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_off00007c12.bin
0335872047abdb0b84234fa2d3a19b13b5b7c4e1b96c7315290c13860b0c8202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 5720 bytes
font_01_sfnt_off00008f5b.bin
0c4926467182771893c194f86873cae4c87d0fbc4ad96e257f18a7c332a3b738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5B 10508 bytes

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