Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a7154f0a942d8…

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04a7d6462e1b6f023df5b42084264d4 SHA-1: ceb837d80e515fb3a195af2c51d03ccfa7e8b511 SHA-256: 281a7154f0a942d85b1282fadd472959f43fcb030d7bca6350a5969e3a484501
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The primary malicious URL is 'https://ttraff.ru/pify?keyword=bidmas+questions+and+answers+ks2', which is likely used to redirect users to a phishing or malware-hosting site. The document body contains garbled text but includes the malicious URL and references to 'bidmas questions and answers ks2', suggesting a lure.

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.ru/pify?keyword=bidmas+questions+and+answers+ks2
    • http://files.mdp.gallery/uploads/1/3/0/8/130874493/telemulevafawafu.pdf
    • http://files.colorblast5k.org/uploads/1/3/1/4/131412235/luloxefotevijunoz.pdf
    • https://cdn.shopify.com/s/files/1/0449/2810/6651/files/learn_accounting_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/worigurejebiwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/bilirrubina_total_valores_normales.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/nexipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/kakegolumufiranejelutefup.pdf
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/ant_video_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/econometrics_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/96817516993.pdf
    • https://cdn.shopify.com/s/files/1/0438/1255/2864/files/elevator_speech_introduction_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/bangla_golper_boi_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/21647237034.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2232/files/pakistani_bridal_images_free.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_off00005c7d.bin
e3160865be137a89a3f31beed7ea3ade337cb8820c30dd2d0e77eb7a8857501c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 5400 bytes
font_01_sfnt_off00006ed0.bin
707061321c0e41c794f47b1863276467f708df75030c9e5bc5c1ee2f55c93927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 10820 bytes

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