Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b0ad81065685df…

MALICIOUS

PDF

49.8 KB Created: 2020-08-04 12:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 903bd9aadcd1fe639b29529d9318e764 SHA-1: a79e56268009d1c026709be162d71f3352ada24e SHA-256: 74b0ad81065685df6cdc3226750a90397cfa6f0d38c7888cc53259f8ae45fa7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign. 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.cc/pify?keyword=ave+maria+english+lyrics+pdf
    • http://files.continuingeducationconsortium.org/uploads/1/3/1/3/131398360/61792f9848b0edb.pdf
    • http://files.winterlightfestival.co.uk/uploads/1/3/1/8/131871992/5771631.pdf
    • http://files.georgiaharvey.net/uploads/1/3/0/9/130969772/5998841.pdf
    • http://files.texasangiesadventures.com/uploads/1/3/1/3/131397973/74c108131b86.pdf
    • http://files.ronsgameroom.com/uploads/1/3/1/4/131437307/9234794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/pid_code_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/academic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/pijotasijanolufujusofif.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/neruzufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/85069914517.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/litidorade.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/liruwiwokadinubedogosij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/novuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/4923/7145/files/35856686459.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/7._1._2._9_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/kukituvomelibej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/33360185759.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c03.bin
a8de53d504e083d02b19037e3daa6d962adafb8854a6b923a460b3c8cbc7d5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 5316 bytes
font_01_sfnt_off00007de1.bin
4e106588f4a69b7db01aa38179fc8e574a97a717109af57ff28a61560a641abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 15860 bytes
font_02_sfnt_off0000ac4e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4E 4324 bytes

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