Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a03a46e92f513…

MALICIOUS

PDF

98.1 KB Created: 2020-08-13 21:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0d1865d30a04e53b905002fc92e671 SHA-1: b84d506ee18b56797071eda7393a40a2d32c46f2 SHA-256: 957a03a46e92f5138d15f1dd9c5b8366e09f63ab21206282433b5dbac99b8554
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.ru/pify?keyword=cefaclor+375+bula+pdf', indicating a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=cefaclor+375+bula+pdf
    • http://dekilamur.risingvines.com/uploads/1/3/2/6/132681670/davuzo.pdf
    • http://files.glowmedica.com/uploads/1/3/0/7/130775245/rudoxibugoviv_kevonudogenuvu.pdf
    • http://vuvixeno.rebeccagaddie.com/uploads/1/3/2/6/132696398/mozutoxa-sulese.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/sogemate.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/62001231361.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/mudov.pdf
    • https://cdn.shopify.com/s/files/1/0440/7033/8725/files/dedozukuvun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/college_general_chemistry_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/81659410691.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/weriti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/867358305.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/1985_honda_shadow_500.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/systems_thinking_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/78308005279.pdf
    • https://cdn.shopify.com/s/files/1/0429/0261/8278/files/blanqueamiento_interno.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_off00012d61.bin
ef79cd61774ea7e62682c69926b42eb6f28f6ee29a12406d454fc6235fa6304f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 5148 bytes
font_01_sfnt_off00013ef5.bin
9e7ec8a3143bbdd0a78d3f36a36d1e294fff508d09d1e7a6cc375a111beaa393
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 14888 bytes
font_02_sfnt_off00016b4f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4F 4324 bytes