Malicious PDF — malware analysis report

Static analysis result for SHA-256 962c29f6ef3dcd68…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 17:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f5ec677cac22ed7dddb0a100dccd67 SHA-1: ba0ca61a3bc9d3677cb4765d9eaed937bb51b3c6 SHA-256: 962c29f6ef3dcd689791a2ef46569d57fb5cdcb1de6a282de138ec938f9c3e9f
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to known malicious infrastructure at ttraff.cc. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=bingo+cards+blank+pdf', indicating a lure to download further content. The ML classifier strongly supports the malicious verdict.

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=bingo+cards+blank+pdf
    • http://files.ikeandlola.com/uploads/1/3/2/3/132302924/685eb02c2eed1.pdf
    • http://files.debbiejackson.org/uploads/1/3/0/7/130776500/xalisa_zitusinorexivis_wurev_koxijusa.pdf
    • http://gigoviji.bubbleandscruff.com/uploads/1/3/2/6/132681670/4376455.pdf
    • http://files.thehonestcatholic.com/uploads/1/3/0/8/130873921/3064113.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/xodopofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/tiwidezeleraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/baparizufe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/58469191047.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/80844450859.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/github_markdown_syntax.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/niviropexofuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2498/0904/files/fixonoripizasexov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/vonafojimikerigepamuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/2693/8018/files/68143304277.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/dejom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/jomivexija.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_off00006285.bin
8958585d6784905e6be6c32efe0f5cfdd63cca001050e53bb5e13d8219180d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 5576 bytes
font_01_sfnt_off0000757d.bin
2c4d159b3795e6d7b26aab959271bfb440ceea95e1d58d7289b5fabfb31453f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 9980 bytes