Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5d1f72736e1cda…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 23:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c8f75d1f7cfea9c2c9b6dab0f0f70be SHA-1: 3c38440b0913e29a872afae221b34400c2b1bf78 SHA-256: 6f5d1f72736e1cda93cf775a9adbabef35df6d72ee858244e634017898e30b33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector, which is a strong indicator of malicious intent, likely to distribute malware. The document body and embedded links suggest a lure for downloading software, specifically an 'autocad pdf converter free download'. The presence of numerous external PDF links further supports the classification as a link farm, often used for SEO manipulation or distributing malicious content.

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=autocad+pdf+converter+free+download
    • http://kejijelev.morriltonfirstpres.com/uploads/1/3/1/0/131070374/5056571.pdf
    • http://files.virginia-art.net/uploads/1/3/0/7/130739522/4a932111.pdf
    • http://files.kingmanaussies.com/uploads/1/3/1/3/131379948/sudoga.pdf
    • http://files.homegrownhighways.com/uploads/1/3/2/8/132814826/dodoluwidinawuba.pdf
    • http://files.glenburnietow.com/uploads/1/3/1/4/131453623/detikope-gudakububoxew-bafumagis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/fivesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/56551559247.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/13899287487.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/20928384491.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/bevivinofitefato.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/24798971623.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/61004555989.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/luzufexima.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/42672051100.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/pipedixodufubaxuluxudiz.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a4.bin
d4183d77e7738cd1c17f221ba950818538b62d83b3dc72ec232531bd5442b4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 5112 bytes
font_01_sfnt_off00007329.bin
fdc443b15334d092c7cbd7536d8f3a22cb775280911e1936de01cb5071d24f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7329 10408 bytes
font_02_sfnt_off000096c6.bin
3088de61ba4d2b01ab234d84e40a42107c4d30a52b1b9bdaf8961d49da71d313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C6 16076 bytes

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