Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c1394d5b2786dd…

MALICIOUS

PDF

49.3 KB Created: 2020-08-03 14:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af78ff63549e3ea36da02f697b65130 SHA-1: b1882e12460dbcedb4be613377d6ae98116ba8d2 SHA-256: e5c1394d5b2786dd1ed3f7cf53409e32a7505a3e9dd9e8697c3b26f00e36aa54
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector, https://ttraff.ru/pify?keyword=anatomical+terminology+worksheet+pdf, disguised as a worksheet. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'Anatomical terminology worksheet pdf'. No scripts were extracted from this sample.

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/pify?keyword=anatomical+terminology+worksheet+pdf
    • http://files.americanmadeexotics.com/uploads/1/3/1/3/131384400/7165702.pdf
    • http://files.societyofstbrigid.net/uploads/1/3/0/7/130776602/muwopevururanazajor.pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/53875145643.pdf
    • https://cdn.shopify.com/s/files/1/0432/4442/1282/files/vikapubitarasedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/vuribinowotafa.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/prodigygame._come_play.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/81910335696.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/paint_sprayers_unlimited.pdf
    • https://cdn.shopify.com/s/files/1/0429/9787/4851/files/6570817399.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/65321045223.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/24800042199.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/kinasut.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/29493353215.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/2017_subaru_impreza_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/dipatisa.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_off00008286.bin
f89d1b3cbcc939fd9122f909db216e076570c840cd8ee4d580fd19395f60d517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8286 5816 bytes
font_01_sfnt_off00009643.bin
8140cccae910589142eabde5979f3adb13ec26a6d40ff9333bd4f0493d272ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9643 9964 bytes

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