Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13b135ead0cd5bf…

MALICIOUS

PDF

45.5 KB Created: 2020-08-21 15:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ff0064606acd4d7b4fa1b74d374303 SHA-1: d9e4cecba53a1b97f54e77c2c96f6cb7df3f6c8a SHA-256: c13b135ead0cd5bfc6a5b71cf076c88c5a896a1609e5365cabbc0e404b478b76
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a mass external PDF link farm. The embedded URL 'https://ttraff.cc/pify?keyword=ozbargain+hungry+jacks+pdf' is a strong indicator of malicious intent, likely serving as a lure for phishing or malware delivery. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links suggests a broad distribution attempt.

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=ozbargain+hungry+jacks+pdf
    • http://files.aliferebooted.com/uploads/1/3/0/7/130775561/6522747.pdf
    • http://files.swhtambulance.org/uploads/1/3/0/7/130739452/f7b4401327b141d.pdf
    • http://bepotof.saludabaptist.org/uploads/1/3/0/9/130969959/2c3c1d07d8.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1703/files/36545937735.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7525/files/holter_ecg_monitor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/julelatugomofanexesowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/6853389665.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/69827053469.pdf
    • https://cdn.shopify.com/s/files/1/0430/7137/3466/files/3d_printer_applications.pdf
    • https://cdn.shopify.com/s/files/1/0449/9007/0943/files/biostatistics_for_dummies_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/shaded_and_unshaded_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/courage_sao_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/riforagugu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/business_environment_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/56550886619.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_off00006501.bin
50e8fe1cb69a9f097ba17d5ab620a68173c4897f1fbb8acfdb7bf0e273143d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 5844 bytes
font_01_sfnt_off000078ec.bin
a229c740b90aee69c801bb3ab310bcb5a73b75acff3d1d56fc191c7450715867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EC 15576 bytes

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