Malicious PDF — malware analysis report

Static analysis result for SHA-256 e376572a22d6b327…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 19:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8a7595ed99ed3bc4fbccbcd63796dc SHA-1: 19c62ae75d35caaeaa1369a3e95752615592708d SHA-256: e376572a22d6b3279aa99e1f14e24031ab64b31449b8da28098ea395343aca86
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=kero+sun+heater+manual'. The document body, though heavily obfuscated, appears to contain text related to a 'kero sun heater manual' and includes the malicious URL. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', suggests a link farm or SEO poisoning attempt to distribute the 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/wix?keyword=kero+sun+heater+manual
    • https://static.usrfiles.com/ugd/b8c837_3430b57eb72440158e15e13c15b71568.pdf
    • https://static.usrfiles.com/ugd/6908d7_01e94ae31a714ff89fc676c56f450b21.pdf
    • https://static.usrfiles.com/ugd/d162e3_2527740485354e1ab15c077e4f7ff81a.pdf
    • https://cdn.shopify.com/s/files/1/0465/4366/7350/files/descargar_drivers_realtek_11n_usb_wireless_lan_utility.pdf
    • https://cdn.shopify.com/s/files/1/0454/7198/9926/files/the_compost_tea_brewing_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/34283476343.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/hesi_critical_care.pdf
    • https://static.usrfiles.com/ugd/a4e402_9967514ab0b847f78821fd74fb51a3c8.pdf
    • https://static.usrfiles.com/ugd/41f880_f155e0f817b14b0eb786a7b7565a9b3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2d2d1ebdadc40988c370930e0a12958.pdf
    • https://static.usrfiles.com/ugd/df4650_c1b0238c120d4395ae9b4da021d5ed44.pdf
    • https://static.usrfiles.com/ugd/b8c837_d607fefdf56643baa73d30d2d1e5e5af.pdf
    • https://static.usrfiles.com/ugd/7f929b_e1d7148114a94a5f816a332d2dad198a.pdf
    • https://static.usrfiles.com/ugd/8cbfce_8a868828da29439085602717986a3eb6.pdf
    • https://static.usrfiles.com/ugd/837d34_9090552417594c8582d4819ab1f24a20.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cad.bin
5eebffce22ee9e30aa672363923d963196e8e3f38389f675e2d6a05c1f19fc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 4896 bytes
font_01_sfnt_off00007d26.bin
596d2bc6ef252abd4fb2880dd6f861a7cb16303866a1d121da897a58b3071cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D26 11320 bytes

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