Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f93e5511d89d6e9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-15 02:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e60dbe2600ae76d139ea36f40f94773f SHA-1: f7a050bca16c20c63be1010451133cd0b913ca4e SHA-256: 3f93e5511d89d6e9da084a0e2f07943029d55f2e803e7ef212b100591d39ea01
130 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a download for 'Whatsapp gb uptodown'. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm abuse to obscure malicious redirects. The document body contains the malicious URL and a call-to-action phrase, reinforcing the lure.

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.com/pify?keyword=whatsapp+gb+uptodown
    • http://files.chiphiisu.org/uploads/1/3/1/6/131606890/puturotujiben.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/pokuwediredepawaxezusaso.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/zofujopolafafiloliper.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5526/files/centrifugal_pump_head_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/49400902026.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/kuvetimaxepesuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/54837770009.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/pifiwotovifegulizunum.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/catering_service_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/jebegemelitow.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/7184364886.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_off000069ea.bin
cab1f65a286f27a9e0d453fb7115774b2201017fa014f38ca205f44929cb78db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EA 5340 bytes
font_01_sfnt_off00007c20.bin
f021f8536acbd127b3a007a3a4726abc92a56a9a4e8fa7c19d3c86fa2755ff2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 9932 bytes

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