Malicious PDF — malware analysis report

Static analysis result for SHA-256 f022fb4ab9413c8d…

MALICIOUS

PDF

44.2 KB Created: 2020-08-12 02:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b935cb9a3c545d9bff6aad9294737a5 SHA-1: e65082d322d963d0baaa56af09c889a59ff9ef3e SHA-256: f022fb4ab9413c8d184354e4e7caaf0f03f2687121e7a564c30086aaf1559ed8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector infrastructure at 'ttraff.ru'. This suggests the document is designed as a link farm or SEO spam to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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/wb?keyword=combine%20multiple%20jpegs%20into%20pdf%20mac
    • http://files.northwoodswolfalliance.org/uploads/1/3/1/4/131408581/fojiji.pdf
    • http://lotasejek.faststartnutrition.com/uploads/1/3/2/6/132682076/8786399.pdf
    • http://jomelizuj.whoi.ca/uploads/1/3/0/7/130776791/4640724.pdf
    • http://fuxini.htm-cornwall.com/uploads/1/3/1/4/131406082/pikulosaj.pdf
    • http://files.itsyoursnapshot.com/uploads/1/3/1/3/131379951/8831503.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1778/files/33709910615.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/93388096042.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/descriptive_research_methodology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/38054259699.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/kekun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/20869933088.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/gujopasusaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6686/7364/files/cdn_cloudflare_jspdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/pifazavexux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/38640744518.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_off00006000.bin
938c0ae9ace3f1155605bd57913492a504783b27da209f6cdcf6dbc14a1c5d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6000 5500 bytes
font_01_sfnt_off000072a4.bin
2e6468235ec49af38fbc2c2686d675fbcf831f7a2230966e755bbf8d28b26d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A4 10128 bytes
font_02_sfnt_off00009562.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9562 4324 bytes

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