Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13c743c5dc81b64…

MALICIOUS

PDF

53.0 KB Created: 2020-08-15 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6cfde9b281e37d822ddc95c38f92723 SHA-1: a5b7ebdace4e53554e7e33c621fb55477f50178b SHA-256: a13c743c5dc81b64d811e432374a1af0101a8e0e1cb3b395265142ab28e6a398
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a deceptive "Notarization and authentication application form" and embeds numerous links. One prominent link directs to a known malicious redirector at `ttraff.ru`. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful sites.

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=notarization+and+authentication+application+form
    • http://files.katiecarrington.com/uploads/1/3/1/4/131438211/tejixakexilapu.pdf
    • http://jidul.lailashesandskin.com/uploads/1/3/1/6/131637419/9668537.pdf
    • http://files.expectantfaithtobe.com/uploads/1/3/1/4/131438759/baxiwojenoref.pdf
    • http://files.hotfootstompers.org/uploads/1/3/1/3/131397946/jexize.pdf
    • http://jiwubugir.jesswinans.com/uploads/1/3/0/7/130775403/netoj_vitekokudapeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/pokemon_blazed_glazed_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/vogogadodiwufusunegejivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/52241999630.pdf
    • https://cdn.shopify.com/s/files/1/0446/5026/6787/files/borrelia_spp.pdf
    • https://cdn.shopify.com/s/files/1/0440/8007/0808/files/iron_jawed_angels_question_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/biblical_meaning_of_love.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/currencies_and_capitals_of_all_countries.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/classification_of_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/76214007886.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/wugixeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/pexodeziwikif.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083c2.bin
70e8915160a8da0a7ef87436e59f93e3685d554ed1d32ba935b938f7da30546a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C2 5116 bytes
font_01_sfnt_off00009501.bin
944a9a52002f399b9ec4d548a26936bcdcaa47b78a538f673a9cfe491088f433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9501 10376 bytes
font_02_sfnt_off0000b872.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 4324 bytes

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