Malicious PDF — malware analysis report

Static analysis result for SHA-256 543658dcf36438c5…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 03:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81058c6150d3e08d738b840fdb7e61e SHA-1: 4f58d3d24dbafc359cab6a277523994cf574ef67 SHA-256: 543658dcf36438c513934d754fcc7bb15b239eb249b8abd71e49d3f329c76e12
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=cbd+oil+benefits+list+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users interested in CBD oil. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve SEO or distribute 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.ru/pify?keyword=cbd+oil+benefits+list+pdf
    • http://files.teamnaomigetwellnow.ca/uploads/1/3/0/7/130776061/piderekifor.pdf
    • http://files.truedaring.ca/uploads/1/3/0/8/130874231/jegevuxafijatew-femurotixan-boriduberi.pdf
    • http://files.jillkinnear.com/uploads/1/3/0/9/130969744/vuzebuf-torizidu-zevumerasamis.pdf
    • http://files.divinesoulcenter.com/uploads/1/3/1/6/131608037/rinazekivepa.pdf
    • http://files.jasminkwan.com/uploads/1/3/1/4/131453248/kubomerebamel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/bestiario_argent_ita.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6464/files/business_idea_development_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/77680966675.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/59248737853.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/menunutuked.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/adenomas_hipofisarios.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/mugamupititenifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/realtek_network_drivers_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/61724499567.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/furerej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/jazafij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/xefopobenepofezevizeg.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_off00006a4c.bin
a4cee95453f2f4777465e891e890e1c9148130a28ce882869b4089c14e00d709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 4680 bytes
font_01_sfnt_off00007a40.bin
77117376ed887d0ccf2df8d9def42b23c686eb1373ce5e5c3acfe1990ef99320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A40 10628 bytes
font_02_sfnt_off00009e64.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E64 4324 bytes

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