Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa5fce70696f61f…

MALICIOUS

PDF

35.7 KB Created: 2020-08-10 14:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed22b1454e6ca5a819b0dc75daea8248 SHA-1: c5588643d0e0ec7a4b0540bf2e881702b7a3e7eb SHA-256: eaa5fce70696f61f5a9907c379aecb4abb430dd613cad320df28aba5453efb02
154 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 of which point to a redirector service (ttraff.com) or other external sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the link to ttraff.com, indicating it leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body text is largely garbled but contains the URL that triggered the redirector heuristic.

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=hernia+femoral+tecnica+quirurgica+pdf
    • http://files.michaeljohnmccarthy.com/uploads/1/3/0/7/130739233/jegagejov_zagolew_wofevowidosute_vetebokal.pdf
    • http://files.jpspalms.com/uploads/1/3/1/4/131410736/c5b81b2b.pdf
    • http://xawugudug.kkpsizx.org/uploads/1/3/1/8/131871980/fomorubimazam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4858/files/gunazipatalonuduxuzuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9076/files/badoxabavepobomibajiti.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/rujurogolovosuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/rolling_stone_top_500_albums.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/80419016569.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/berker_k1_katalog.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5029/files/sonotube_concrete_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0431/6682/6656/files/bisutalalaxom.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/mamotibizibexelijumux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/muwakadis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/65938296540.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/92206752811.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/caribou_coffee_menu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/app_to_convert_into_word_file.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_off00004e7f.bin
ccca67b296d858e40d99197a00752ff240e61d09ce11a3fe55d27c37c38ec7d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E7F 5384 bytes
font_01_sfnt_off000060a6.bin
c23f82cfc794f20e280ef5172fefb0bd6f6663a7c323c9fefc5e76fd765d1a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 9704 bytes

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