Malicious PDF — malware analysis report

Static analysis result for SHA-256 7764cfd2828e7e36…

MALICIOUS

PDF

47.7 KB Created: 2020-08-29 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dfea7e70df1fbab18c542984418a880 SHA-1: c8ac8b8dd36c0def5a5ce41ae1fd4c1f452e6c33 SHA-256: 7764cfd2828e7e36167ff4831da72315b6209dbae466743175fa6c398c4395f1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'motorola surfboard sb5101 usb cable modem driver download windows 7', suggesting a lure to trick users into clicking the malicious link. The presence of multiple external PDF links also indicates a link farm, often used for SEO poisoning or to host 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.ru/wix?keyword=motorola+surfboard+sb5101+usb+cable+modem+driver+download+windows+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_5534b1fd798b4bd2ab91d8ec39330eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_21a1103e3d4d47baa08e31105c826bcb.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_40f2bcffc254409c991892818e6d55ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a100c83d16a43589864b418de5a962b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a8fc68806234fb794227a31545e13cb.pdf
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/averitt_bill_of_lading.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/23059917523.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/xurutenevedevakasanepodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/gradle_5._4._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1365/files/types_of_dialysis_machines.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/gogukevukujagijag.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/tawomejifekotujusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/mathematical_modelling_of_engineering_problems.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/52732775921.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f4.bin
525a59a4f162b6fff7af60ec453ce6d8be3788c9df1ffc1ef052df34531519d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F4 5744 bytes
font_01_sfnt_off00007783.bin
21b18eba68f70623df39e1758187b3cc2b67296ae197173105f76c97a0b2eb95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7783 13668 bytes
font_02_sfnt_off0000a2d2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D2 4324 bytes

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