Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa3dcd96c396421…

MALICIOUS

PDF

48.2 KB Created: 2020-08-19 02:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d080e497f030d81f735294e40e859f3 SHA-1: d6d13592c2cc18d9f8f3ed33876f222cf429d26e SHA-256: 5aa3dcd96c396421caf2188163d46e8ad4a1b5027d9f330326081e49c717fcc0
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 a redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://ttraff.ru/pify?keyword=current+affairs+november+2018+pdf+in+english, which is likely used to redirect users to further 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.ru/pify?keyword=current+affairs+november+2018+pdf+in+english
    • http://files.centennialpto.org/uploads/1/3/0/7/130775154/1471241.pdf
    • http://files.hollywoodscreenings.org/uploads/1/3/0/9/130969082/8779736.pdf
    • http://files.adventures-with-photos.ca/uploads/1/3/1/3/131380308/7015047.pdf
    • http://muzanowe.bouncehopper.com/uploads/1/3/0/7/130738731/1442820.pdf
    • http://rojatabi.iljadecoster.be/uploads/1/3/1/3/131381882/gigawebirumubow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/2139449643.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/togabuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/p4merge_git_mac.pdf
    • https://cdn.shopify.com/s/files/1/0452/5365/6738/files/47596949512.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3264/files/43753288714.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/pavajexiwenisikevapup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/83549716292.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/62455703142.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/pewivabux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/palmistry_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1058/files/68380996015.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_off00006fb1.bin
5252faf32443ec7e326b0772b63064c9ae33accecb50c36f9307134aba3ad01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 6080 bytes
font_01_sfnt_off00008438.bin
2f8a27a18a7851ca77cb34ca8ac639c246cd33a5c4ac060ca1a57dad2c43f746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 10360 bytes
font_02_sfnt_off0000a7d8.bin
a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D8 2832 bytes

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