Malicious PDF — malware analysis report

Static analysis result for SHA-256 06aa62acae575aac…

MALICIOUS

PDF

49.1 KB Created: 2020-08-09 22:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b4f6f77c1b51f39896f99c5da24d31b SHA-1: 3b50e0ad6c209af18c2a2ae543c5510b86c5cbba SHA-256: 06aa62acae575aac7a4ea51e5958189d0b2641179fd422f1e9bdcf33a311ec2e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.ru/pify?keyword=basic+english+course+for+adults+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating its likely purpose is to redirect users to malicious infrastructure. 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.ru/pify?keyword=basic+english+course+for+adults+pdf
    • http://files.foresthillbaptistchurch.com/uploads/1/3/1/3/131398143/lefor-marafitisunofo.pdf
    • http://files.fromsistertosister.com/uploads/1/3/0/7/130775462/c83a1aa.pdf
    • http://files.stevensmithauthor.com/uploads/1/3/0/9/130969580/3825718.pdf
    • http://files.rockwellamezchurch.org/uploads/1/3/1/3/131398542/padorigegutuvirofopu.pdf
    • http://files.lavenderlagoon.com/uploads/1/3/1/8/131856170/203ff66a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/2127088977.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/61355527102.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/53152997806.pdf
    • https://cdn.shopify.com/s/files/1/0428/8865/9100/files/consequential_loss_insurance.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/tusavivonelefojipidivu.pdf
    • https://cdn.shopify.com/s/files/1/0451/3605/2389/files/lcpdfr_callouts_mod.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1919/files/nafufezodigopukoxut.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/pidomizejuvufonasixup.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/axis_bank_corporate_internet_banking.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/xazuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/one_piece_colored_manga.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_off00008208.bin
59d0516659424b2e4dc18edf44f45996a55b3e9f9b65bd2e3d4de4dc3d29d5ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8208 5468 bytes
font_01_sfnt_off00009498.bin
6c59dacb11909f8cd052188b5d878db85091ab095611426edd1cf7a0e22854e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9498 10060 bytes

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