Malicious PDF — malware analysis report

Static analysis result for SHA-256 161ac2f15aefaa85…

MALICIOUS

PDF

51.8 KB Created: 2020-08-11 12:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f245970f2c103cf0d85a99bfac7ab6b SHA-1: 0aa3b62adaa5a10002c899655a67f5dcac009a2e SHA-256: 161ac2f15aefaa851308b0a03a6b8cb39ff40432d1edb8ea682057666ea57fdf
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=logic+gates+truth+tables+pdf, which is likely used to obscure the final destination. 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.ru/pify?keyword=logic+gates+truth+tables+pdf
    • http://files.bckamsler.com/uploads/1/3/1/3/131384127/3185374.pdf
    • http://fudurep.thebridgechurchli.com/uploads/1/3/0/7/130738614/10b60c0e7.pdf
    • http://files.livingwellwholefoods.ca/uploads/1/3/1/3/131380951/d8e4970b.pdf
    • http://womupij.perfectfreq.com/uploads/1/3/0/8/130873995/tojisawaxikeket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/65488654983.pdf
    • https://cdn.shopify.com/s/files/1/0434/4191/4006/files/rotegosunijixufivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/wuwimurumagetipomozi.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/raxevuvodumoxumelov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/76903612018.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/jonuvipikole.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/java_convert_inputstream_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/40614781731.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/bikabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/wulomefawopufujobesezupu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/23251263417.pdf
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/77026226685.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/candy_box_wiki.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ac.bin
d3ec76668ad168b9dfd7d6d7cdc1b55a6274ed82bd7538eaa0cd26ad6951d09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 5496 bytes
font_01_sfnt_off00008751.bin
63dde64dc72e76aa578a23d2fb30f76b27e4df887d834abcda85f02a9ffb7ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 10380 bytes
font_02_sfnt_off0000aacf.bin
ca6fca704cf7b4e59dcc3dd44c2f1c4aff85945f846e4f0f4a5303a9c5106421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACF 16804 bytes

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