Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051bfc0ce6f2494…

MALICIOUS

PDF

60.8 KB Created: 2020-08-21 00:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21e06d73ad27be4a8879771a22eee74 SHA-1: b8dce8447cf3b4ccff657b7f2617874b40e9574b SHA-256: a051bfc0ce6f2494b1d85e634060e956f9d70bb92fe9888769f5c31745e5f4dd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to 'ttraff.cc', which is flagged as malicious. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'happy birthday fonts calligraphy'. No scripts were extracted, but the presence of the malicious redirector and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=happy+birthday+fonts+calligraphy
    • http://nadefigik.jammiemelgar.com/uploads/1/3/0/7/130775350/ab8dba9f.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/56429172329.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/statistical_rethinking_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/33163832194.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/44689211407.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4911/files/antares_autotune_studio_one_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/50194219503.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/11688401065.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/spanish_preterite_vs_imperfect_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/types_of_antimicrobial_agents.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/59763426642.pdf
    • https://cdn.shopify.com/s/files/1/0445/4078/8895/files/nabegusiton.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/72961416104.pdf
    • https://cdn.shopify.com/s/files/1/0457/4520/9500/files/68131341875.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cdd.bin
bd7b18de9e7eb10c0b18aed82736293a61eae61742570c5058b7bccc13309621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDD 5620 bytes
font_01_sfnt_off00005fe9.bin
4d578c43c50f6d87724e9c67c5296a81acb5cf55f95536f83a7e01238453d482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 28692 bytes
font_02_sfnt_off0000914f.bin
e0f6c18ec52aecd4e68963d71c7044648317060773caa88fcb33a421ab6cc142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914F 12428 bytes
font_03_sfnt_off0000bd53.bin
1dafb440f17ba242016d697c3d0707173e728d879600add6a371cb6fe2e63780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 11920 bytes

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