Malicious PDF — malware analysis report

Static analysis result for SHA-256 057fa7bd1db427d6…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 08:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6595c3bfe3f34665d4078f6a1340358 SHA-1: 016765c4fda002f4ba17103ee43a5b504280194b SHA-256: 057fa7bd1db427d6857b1b1f4333d341ccdf981a631e37ee8544a8932f0e84d9
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 link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=free+math+worksheets+kindergarten+counting', is flagged as a malicious redirector. This suggests the document is part of a campaign to drive traffic to malicious sites, likely for phishing or malware distribution.

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=free+math+worksheets+kindergarten+counting
    • http://files.saltsuit.com/uploads/1/3/1/4/131406592/d26f70e377d.pdf
    • http://files.oldnytours.com/uploads/1/3/1/0/131071157/fodabinob-popodojexufaf-zaponerizaf-guruxupipixuzo.pdf
    • http://files.anthonstmaarten.com/uploads/1/3/1/8/131857315/4718996.pdf
    • http://files.southsidenazarenechurch.ca/uploads/1/3/1/3/131381612/rolanujugotu.pdf
    • http://tobiz.pricecityutah.com/uploads/1/3/1/3/131379874/kisob_rizanuxufok_wewamevibex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/4442/9984/files/zusidonubusunexejutufasif.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/white_bed_sheets_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/wanting_memories_satb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/minecraft_64_bit_java.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/bioreactor_design_and_operation.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/delegation_of_parental_authority_form_michigan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/97296697088.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/pulakaxugafamutub.pdf
    • https://cdn.shopify.com/s/files/1/0436/3455/7088/files/halloween_worksheets_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/lopedulafim.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/argala_stotram_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5821/4565/files/cardiomiopata_de_takotsubo.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_off00006ff0.bin
99cb09abe8e07a4a2407ff2b71d29401dbcd77beef2f6cfc58107cad95446fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF0 5432 bytes
font_01_sfnt_off00008257.bin
ac22c0b631c5a4c04f1e16077dce65d912761e9f2a5b0cf511f05458f545796f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 10056 bytes

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