Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bec611d78c849b…

MALICIOUS

PDF

55.1 KB Created: 2020-08-05 04:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f68842fa637b628cb84d5146ce6afb01 SHA-1: acfc0a6d47f89095232c5b606603c790645c423d SHA-256: 98bec611d78c849ba83303ce511e6abc0b9539dc11421181079345090c080cd2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL 'https://ttraff.cc/pify?keyword=anodic+protection+pdf', which is likely the initial point of redirection.

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=anodic+protection+pdf
    • http://files.exeterthreading.co.uk/uploads/1/3/1/4/131437736/dilap.pdf
    • http://files.tonystiedyes.com/uploads/1/3/1/6/131606965/8555274.pdf
    • http://files.byronbayhealthycommunication.com/uploads/1/3/0/7/130740148/xidipapukitafo.pdf
    • http://files.studiojigi.com/uploads/1/3/1/4/131410158/zuduzizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/acid_rap_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/31528923950.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/bogodoxudibil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/duwugixes.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5687/files/33298255129.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/29650491399.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/vajuvovebukelulikopugesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/pdf_splitter_page_range_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/90435316792.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/busagomukazoton.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/78549041704.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/zesubukovilutujivutenuzuv.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_off00009b16.bin
9080ceb4035a68ab070079bd6f5de709d7603172f9a64cea2c00a5057ec1f9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B16 4716 bytes
font_01_sfnt_off0000ab38.bin
43cc1be6fc4428edc2c52985a3dfffe1110e8dd74fa0d943eed64dd9ecdc1951
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB38 10744 bytes