Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f22c772584e3f…

MALICIOUS

PDF

37.5 KB Created: 2020-08-02 01:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25a0eecdc084f62bb5c3f5bb070d5191 SHA-1: 04af1fabb6266f2790aba05a23e9e03753fcdb40 SHA-256: bf9f22c772584e3f2be05a658dd64950b84b295c1e0cf706aab4b3756c9534a0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=square+d+heater+charts'. This URL is likely part of a phishing or malware distribution chain. The document also contains a large number of embedded links to PDFs hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=square+d+heater+charts
    • http://files.rosieraestoffee.com/uploads/1/3/1/6/131606291/dowir.pdf
    • http://files.granitefallsbandprogram.com/uploads/1/3/0/7/130776858/a299abf816fa63a.pdf
    • http://files.panasiatourist.com/uploads/1/3/1/8/131856330/vudefefudu_limelemelagupez_kokizowudiza_zevok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/kumomuzomesinafuvalofej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/fufameziwateduxutixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/wubixodamuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/17490854984.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/kujixenosarekugide.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/foduvekarudalilum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/mokupukurozitapiwen.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/67333628814.pdf
    • https://cdn.shopify.com/s/files/1/0428/0067/7031/files/59092757331.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/837725455.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/soncino_talmud_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/21441893154.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_off000048df.bin
d1c8bf61f8ccb61e34c563ff86ef0a3e3483db5ea1f826e4181875f19a520f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48DF 4840 bytes
font_01_sfnt_off00005959.bin
1e0f4ca53323a55ea1be6accda7bc32bc014daf49e918dd3772e067b5d976cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 9844 bytes
font_02_sfnt_off00007b11.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 4324 bytes

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