Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b5475732f11c37…

MALICIOUS

PDF

37.2 KB Created: 2020-08-14 22:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac1ab7e428c1b68951982b75f1706a3 SHA-1: e030fc3c5c6d89fae4498ced57acb1f7545006f5 SHA-256: b3b5475732f11c3712978155acfe10c0add96ebcb1e55ea23fa0c008f015c388
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a product deal for 'childrens fleece sheets'. This link, https://ttraff.com/pify?keyword=childrens+fleece+sheets, redirects to known malicious infrastructure. The document also contains a large number of embedded links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=childrens+fleece+sheets
    • http://zafesexu.tyrendarraagriculturalshow.com.au/uploads/1/3/0/7/130776445/6304560.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/55515477027.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/cascading_style_sheets_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/lanigozebe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/mamat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/85626723715.pdf
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/10591953503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wofizafadunemewu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/asme_v_2020_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/dotazuzukadofupasixox.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/pulagimuwakagexabirog.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/sefeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/penofofuvenudibogoni.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_off0000551e.bin
ff55bd45ac6b38ebb40139deb744ff485da67298ac336780e42409d9249376dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x551E 4804 bytes
font_01_sfnt_off00006561.bin
6b4f93c43fb5b353dcdd7ff2be76c4b3cb1375ac3c9f6cbfd42b0db52a074ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 10312 bytes