Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b6b740de80764…

MALICIOUS

PDF

44.8 KB Created: 2020-08-08 08:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 716b06ffed31231e6ddb687e6abc78e0 SHA-1: a07fbcde975b65ece9f0b46122111baa66c16918 SHA-256: 798b6b740de80764adde214180d6d3e89628a81a9b02b85c118a67e7cb1511bf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous external links. The primary malicious URL is https://ttraff.com/pify?keyword=aging+process+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.com/pify?keyword=aging+process+pdf
    • http://files.elegantcooking.com/uploads/1/3/2/7/132710638/2920870.pdf
    • http://files.arrowdancestudio.com/uploads/1/3/1/3/131379296/tisewufedu_xorodegupokux_gigadukewusa.pdf
    • http://files.maplecountryanglers.com/uploads/1/3/2/6/132695301/rexatozekemozomefon.pdf
    • http://lubolew.materials-glasgow.org/uploads/1/3/1/0/131070331/xiluxolubidexamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/56130131864.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/printable_calendar_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/collide_lyrics_kid_rock.pdf
    • https://cdn.shopify.com/s/files/1/0434/5472/6310/files/misasavakujujokalarolam.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/25279607029.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/98433529907.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/lexojuvowusofasavonamev.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/xagusuxofo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/pevibanuxotiseziwip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/s_10_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/59442832420.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/8137805865.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/pefigavinibuja.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_off0000719d.bin
3fb6b1ba931426d8b4fa6d07b68b8a3282725a87df1eae5d82e22b6673bd3c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719D 5068 bytes
font_01_sfnt_off000082f9.bin
b5966a1fe0cc499f5c962977a9d5b33ce54484cffaae9daefff4bbf0b293d433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F9 10668 bytes

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