Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8717fcb20b6fe7…

MALICIOUS

PDF

50.3 KB Created: 2020-08-04 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a072fa3a7cd0d9a7693bfd3ed1a8d2 SHA-1: b3451ef28ee9f5b50c0aee5a5984c535693ce4d9 SHA-256: 4b8717fcb20b6fe7afedd07982b462ccc8d2bd4c74222167025c97614c72c2d9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a 'claim adjudication process'. This indicates a phishing or malware delivery attempt. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination.

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.cc/pify?keyword=claim+adjudication+process+pdf
    • http://files.jessicafineartist.com/uploads/1/3/1/3/131384335/linoz.pdf
    • http://refaba.mikezamojski.com/uploads/1/3/2/7/132740435/peradim.pdf
    • http://files.energyharmonybalance.com/uploads/1/3/0/8/130873983/5388603.pdf
    • http://files.uesosu.org/uploads/1/3/0/7/130776366/furojojuvajez.pdf
    • http://nunovi.racepartsliquidators.com/uploads/1/3/1/4/131407668/875432.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/33426802214.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/sqlalchemy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/pejejedexowujiniful.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/59663248824.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/luvapelexovubezulodipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/2458799317.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/29351299238.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/64076666553.pdf
    • https://cdn.shopify.com/s/files/1/0432/6719/5040/files/derenurorumuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/dusiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008736.bin
b87068453b57859122d37eedb3821c7e98641cfbb554ffa68ac7f5a84449865e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8736 5280 bytes
font_01_sfnt_off00009917.bin
c0ad3144d1d4a57327bbdc104f986c0247061b862d69154044c115bfbeaaa175
pdf-font-stream PDF embedded font (sfnt) at offset 0x9917 10192 bytes