Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cfd99e14a0f865…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 07:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28d654dd5afd1b86f547bc8cf385b55d SHA-1: 369dec50aac8eb507fadbef32a07fb90cc63a9fa SHA-256: f1cfd99e14a0f865051af38d26f7a7deaf62755cde0ba1f6127186f8ee64e0f5
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm pointing to a known malicious redirector. The document body contains text related to 'Aplikasi bubble shooter 2019' and includes the malicious URL, suggesting a lure to entice users to click through to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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=aplikasi+bubble+shooter+2019
    • http://files.yasense-excel-opc-live-data.com/uploads/1/3/2/6/132696145/310b99ff.pdf
    • http://files.kickapoovolleyball.com/uploads/1/3/0/8/130814515/0ef50fec9265.pdf
    • http://files.yauponberrypress.com/uploads/1/3/2/6/132683463/4986403.pdf
    • http://files.artfultim.com/uploads/1/3/1/4/131453065/dbe7083d8.pdf
    • http://files.alwaysthereliving.com/uploads/1/3/2/6/132681625/a621290ef78d1.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/revomonawirufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/zoligusidipabuwibavuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/48676154512.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7596/files/ragijegerovoseg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/git_delete_untracked_files.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/17059951000.pdf
    • https://cdn.shopify.com/s/files/1/0433/8447/1710/files/39158704117.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/careless_whisper_tab.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_off00005bdf.bin
fd80236b3bcc7b9a395825011a7119511428e77f9e3821056258ff987a81175a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 5584 bytes
font_01_sfnt_off00006ec7.bin
43e5d4fc0d4428b10bf2ef48c8777cc97764c1db90702d259d0319c0455cce5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10604 bytes