Malicious PDF — malware analysis report

Static analysis result for SHA-256 593f251447a79cb3…

MALICIOUS

PDF

51.2 KB Created: 2020-08-02 21:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28c22b8adb9d6019ff45ce2fc35dff6e SHA-1: aad843f2b2be61b0d407421521a9d5a46bd74248 SHA-256: 593f251447a79cb3d88d21f1637888dc17cee43e17076f59f2a011ff7f43891c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL found in the heuristics, suggesting a lure to a phishing or malware distribution site. No scripts were extracted from this sample.

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.com/pify?keyword=farrah+superstar%253A+backdoor+teen+mom
    • http://files.vegasvoicelessons.com/uploads/1/3/1/8/131871488/newagono-pinuxid-lisejuzoselulet-nafedilajaf.pdf
    • http://files.bethelhouseinc.org/uploads/1/3/1/8/131857756/desuxeze_litakefi_waxisalota_gesusan.pdf
    • http://files.keckmanagementroofing.com/uploads/1/3/1/3/131380612/xofulikokogeg_dutiribosavimep_ripes_mobilomipuxodo.pdf
    • http://files.holmesdecor.com/uploads/1/3/1/8/131856185/gojexu-gizag-wijifirimimufe-xuvifujasur.pdf
    • http://files.moonriverdesign.net/uploads/1/3/1/8/131856492/rimikurepopibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5823/files/19970092223.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/pojebajojuletokutagi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9527/7214/files/vaseruvi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/vamomuzesukabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/vovuwib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/fonoruwatorowelefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/93268988412.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/lalutezed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/43866571628.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/lazositot.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/tepijubemimo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/22640411125.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000715d.bin
fbb2b72a01c0e14eb1fa374cb5ee0afb9e0546f3d1c81a68e8ade20a5b78c0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 5324 bytes
font_01_sfnt_off00008335.bin
7f6932b20bf41ae4f421cc66729d9c196d6ca69824529ae7f52037a9d756317b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8335 1976 bytes
font_02_sfnt_off00008c85.bin
98fc4c1cfb25ae4adffeec560f69ab7a97c401451287e7599ddd6f6989cb6a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C85 10696 bytes
font_03_sfnt_off0000b104.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 4324 bytes

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