Malicious PDF — malware analysis report

Static analysis result for SHA-256 90363cdde910e3f2…

MALICIOUS

PDF

41.4 KB Created: 2020-08-02 17:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1fc65b70d6f0fea850c4d10c3027a51 SHA-1: 1c577ee201cbd90a5177f0ff82cf2b685beb18af SHA-256: 90363cdde910e3f25a2381533eb7f388dfc6b0c9e4b2f8ff5a04a2d0fa78f872
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to external PDFs, with one URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse for traffic redirection.

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=866-+928-+0183
    • http://files.diamondstatechorus.org/uploads/1/3/1/0/131070829/d21d2597e0.pdf
    • http://files.upcycledonline.com/uploads/1/3/0/9/130969339/2735800.pdf
    • http://files.missbareham.com.au/uploads/1/3/1/4/131438260/ea4dbfeeb1ed.pdf
    • http://files.littlepodcastontheprairie.com/uploads/1/3/2/7/132740377/dexogusaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/54972963855.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0437/8738/7037/files/boxumin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/tanegomopulapiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/kexox.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/fisher_wood_stove.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/ya_devi_sarva_bhuteshu_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/neretekidu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/bitofajo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/zoxubisapatasixumawubisor.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/pefewufabimukilujufeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/99539275329.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/
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/pefewufabimuki

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a5.bin
e818f3f9cd2b67253f8590b4b6db8f54027e6eae8d9e6751e1b9fb046237490a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A5 4420 bytes
font_01_sfnt_off00006788.bin
494441e8349c6fab5cda8a08fbab01cf4f96246106fecfae4b0871696edd6502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 10196 bytes
font_02_sfnt_off00008a6d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 4324 bytes

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