Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc68e04b8e6ea0da…

MALICIOUS

PDF

48.1 KB Created: 2020-08-07 22:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b4885d78830a64e8da387fe4d1d5d4f SHA-1: 79936a02faef25a38a0f89a7485e40547ef6c71d SHA-256: dc68e04b8e6ea0da1807fbfbf8ea08e10a28a85213e1477db29edfbaee85a029
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a link farm identified by heuristics. One critical heuristic indicates a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though partially corrupted, contains text related to 'articles a an the quiz pdf' and the malicious URL, suggesting a lure to engage the user. The ML classifier also 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.cc/pify?keyword=articles+a+an+the+quiz+pdf
    • http://files.deltaworkready.com/uploads/1/3/0/7/130775998/f95c7d.pdf
    • http://files.sandbachosteopaths.com/uploads/1/3/0/9/130969992/2415842.pdf
    • http://files.thelupiegirl.com/uploads/1/3/1/4/131483029/zebodoluxunapiripu.pdf
    • http://files.honors200malta2016.com/uploads/1/3/0/8/130813428/9243020.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/dikikubikogo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0053/4952/files/vebuwifosirunewibuzeja.pdf
    • https://cdn.shopify.com/s/files/1/0438/8595/3192/files/kupijazawopatote.pdf
    • https://cdn.shopify.com/s/files/1/0439/0574/5051/files/riluxejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/99619139434.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/aprendizaje_basado_en_proyectos_itesm.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/88511381948.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/jagabatetuforo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4734/files/sintomas_de_retinopatia_diabetica.pdf
    • https://cdn.shopify.com/s/files/1/0434/2258/0886/files/29908786700.pdf
    • https://cdn.shopify.com/s/files/1/0448/1400/8486/files/gout_foods_to_avoid_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/spss_survival_manual.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_off0000669a.bin
950b0fa4875f7a5b776220adb323d0144b64946d155239caa3f85c07994dbcf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669A 5408 bytes
font_01_sfnt_off00007905.bin
f45b49a8074df54da8b78d069e336b4e2dc83d49b528ebec5c316166de9de040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7905 11056 bytes
font_02_sfnt_off00009e2b.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2B 16092 bytes

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