Malicious PDF — malware analysis report

Static analysis result for SHA-256 8099e98b9772b94c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 17:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f3e0cb66021f80f5ff43f5308d0aba SHA-1: cf0569e3274d9cb7cddea9e31a15e420e365aac8 SHA-256: 8099e98b9772b94c97b8be1e2afdc2f496358a6ac59c4bf58b20f7d85e630710
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, includes the URL that is also present in the heuristics and IOCs, suggesting a lure to a malicious site disguised as a PDF download. 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.cc/pify?keyword=proyecto+de+azoteas+verdes+pdf
    • http://files.blackperiodinc.com/uploads/1/3/0/7/130740292/3823141.pdf
    • http://files.sallyrothchildceramics.com/uploads/1/3/2/6/132695339/lezewerulasivoxopir.pdf
    • http://files.designsbykneeknee.com/uploads/1/3/2/6/132682076/619012.pdf
    • http://files.charliebreckenridge.com/uploads/1/3/1/4/131437493/d723e9.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/online_converter_jpg_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/kiwuvipemejopel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/29479898958.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/gexazuvoful.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/batotilabijasoxeravizese.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/57603411204.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/list_of_rules_for_discord_servers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/11182958700.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6867/files/38170349779.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_off000062f3.bin
8b4f0e195cc3aa3ce9670772e65be4b11b5d643e3b6a39f86389d88b21c1a7c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5332 bytes
font_01_sfnt_off0000753b.bin
17f8db53ab207cede0dc7ef119624efca086d1f944cb6dd10b2582d42ada81b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 11280 bytes