Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f1767622f3e768…

MALICIOUS

PDF

41.3 KB Created: 2020-08-02 19:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a7d60200c3eb6e7eb48f375952e3bfc SHA-1: 0a0af95e00d144d6cacd6c6eb8d56cab601759d5 SHA-256: 84f1767622f3e7689fde9aff3a1a5a1061e4d2347eee21d3f59bc573f2939b67
128 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily corrupted, contains text related to reducing PDF size and includes the malicious URL. This suggests a social engineering lure to redirect users to malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=reduce%20pdf%20size%20online%20free%20in%20kb
    • http://files.manzanitaspreschool.org/uploads/1/3/0/7/130776673/pimudavisafamipawopa.pdf
    • http://files.mylgtg.com/uploads/1/3/1/6/131607467/zetaruwunetopasus.pdf
    • http://files.channingbenjamin.com/uploads/1/3/1/8/131871558/virepinutes.pdf
    • http://files.didactic-engineering.com/uploads/1/3/1/4/131438002/rinusula_pilizuwar_pusanezesoni.pdf
    • http://files.thewisdenartist.com/uploads/1/3/1/8/131871593/2e7a538.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7900/files/66662191922.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/69389810833.pdf
    • https://cdn.shopify.com/s/files/1/0430/1189/9545/files/61830870882.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/zegebiwowudefasukeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/91866651618.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/50697784180.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/3862459330.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/napuzamotaza.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/mazirixamuko.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/tirexofolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6996/4439/files/fusolibogedan.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/sidimewedubevud.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
font_00_sfnt_off0000562e.bin
8bf20b9963d8bd57bd61ab52d2c8b409fb146922112a75f592c39abe8c1a506e
pdf-font-stream PDF embedded font (sfnt) at offset 0x562E 5004 bytes
font_01_sfnt_off00006739.bin
0fe9d874be9ab4473333bd32259ec53f725a29afdacbe2ab1be4fb124f362d45
pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 10208 bytes
font_02_sfnt_off00008a0f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0F 4324 bytes