Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce44d32c9717883…

MALICIOUS

PDF

43.1 KB Created: 2020-08-17 14:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad0a6dab9f9ed856a5bd00863f583db SHA-1: 2a12b5c9f1c90885622962208c4ac7ee3ea5ffeb SHA-256: fce44d32c9717883f406eadb3ffa22d3855340b57365048c05c9ba046575b9a0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'triple digit addition worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent. The PDF also exhibits a link farm heuristic, pointing to numerous external PDF files, many hosted on Shopify, which is a common tactic for SEO poisoning and distributing malicious content.

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=triple+digit+addition+worksheets+no+regrouping
    • http://files.suzannejjames.com/uploads/1/3/0/9/130969485/080aafb14574.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/76754545528.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/beniwixobas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7138/1405/files/readeon_tv_movie_radio_player.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/24097199267.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/english_spanish_medical_words_and_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7364/files/tes_psikotes_cfit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/viretitorijewami.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6157/files/kadavixelogedi.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_off0000623e.bin
52f16a1e013d20a0ba236f43522c5042601f3dc9eba1b40e44e9f88a1d99323a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623E 5328 bytes
font_01_sfnt_off00007460.bin
65edabb1c94dcc3b3f0b8cffe37e1d7546c889941f2dd5112f818de9f970592f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7460 13760 bytes

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