Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee85f554c488f0c…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 04:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c1f54ad79bd6637e8fc21a83e8a3a1f SHA-1: 08e10a3997ca6838954ed7036db5e5ff38503b02 SHA-256: bee85f554c488f0cabf71ea505dbbe3347c8b2d011f5bb1e77133bbf76095042
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, directing users to a URL containing a lure related to 'Android video call app source code'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, though these appear benign. The primary malicious indicator is the redirector link, suggesting a phishing or social engineering attempt to drive traffic to malicious infrastructure.

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.com/wix?keyword=android+video+call+app+source+code
    • https://static.usrfiles.com/ugd/b8c837_5431cf09338943e1aea18224c43422c1.pdf
    • https://static.usrfiles.com/ugd/4b874d_86cf5ebb31774d92a76273aad60916a9.pdf
    • https://static.usrfiles.com/ugd/d4579c_10a798b0c75b4a95b68b618149599647.pdf
    • https://static.usrfiles.com/ugd/9b5f63_0ff006711f0d42d8a9e3b3eece5c7de6.pdf
    • https://static.usrfiles.com/ugd/db93e9_ef4823a268ec4cceb3f122a9e0bf82c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0f8ea63f4914060bdd63a13a00a6487.pdf
    • https://static.usrfiles.com/ugd/77eba6_d51332c21c964e329219b4b395bf1bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f369167a16424859b507f67f9304f693.pdf
    • https://static.usrfiles.com/ugd/5b9a87_d06e269881a246bb8ffc51300559d291.pdf
    • https://static.usrfiles.com/ugd/33c377_45cd7676f5454279b1bac38cdbcd2cfa.pdf
    • https://static.usrfiles.com/ugd/07e02c_be7f5a5e578d42a8a266e97c5df69440.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/joindre_un__un_fichier_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/walter_isaacson_da_vinci_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2507/1256/files/budesonide_formoterol_inhaler_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/47968285688.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/calculus_olympiad_problems.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_off000069bb.bin
7f3216205dde00e09c80c348009f05017a7f4b6a8f497636628ab6895b11dd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 5116 bytes
font_01_sfnt_off00007b33.bin
350f2b9aca23031934b74411ff6d0a47c1ddcfde20217d4acd56ffccf9acfb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 10284 bytes

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