Malicious PDF — malware analysis report

Static analysis result for SHA-256 be776bb8064b64dc…

MALICIOUS

PDF

47.7 KB Created: 2020-08-30 22:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 426cfe839244e2903cc44739f125024a SHA-1: dad362532071bf58ae5853f485a24769e97f0b73 SHA-256: be776bb8064b64dc00c2abf6a420794c07fc643ca455cddca3a3a9d01ccbac97
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for SEO spam or to redirect users to malicious sites. One critical heuristic firing indicated a link to known malicious redirector infrastructure at 'ttraff.ru'. Another critical heuristic identified a PDF link farm, with the first URL pointing to 'cdn.shopify.com/s/files/1/0433/8669/9925/files/solaxanewa.pdf'. The document body contains garbled text but also includes the same URLs, reinforcing their presence.

Heuristics 3

  • 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.
  • 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=vertederos+de+pared+delgada
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/solaxanewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6419/7273/files/league_ashe_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4884/files/sawinifedilakuzigujuwuto.pdf
    • https://static.usrfiles.com/ugd/b8c837_4493b3712e744fbdae29f68889328556.pdf
    • https://static.usrfiles.com/ugd/accd1f_f48d48c10982441ab0bf826bae840930.pdf
    • https://static.usrfiles.com/ugd/6cf392_e7881593137641e381e9e709ca84ef65.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/x_ray_resource_pack.pdf
    • https://cdn.shopify.com/s/files/1/0438/0806/3649/files/are_vpn_worth_it.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/84482430934.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1943/files/58767865049.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/como_activar_letra_capital_en_word_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009344.bin
7b19f98dfc4a89262846d506fd8ec6024e9f39e01a8d21978c3a278590e1c341		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9344 18452 bytes
font_00_sfnt_off00005c91.bin
713ee49815469a584edd892d86dff21c880f22032b99ee0e40ca2dc82a0b808f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C91 5092 bytes
font_01_sfnt_off00006df0.bin
0741f409f1b5bdd27ff2ae1b08ea9225b49b6e10cd10ca87c40198511cc1916a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 11360 bytes

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