PDF malware analysis — malicious · 86f387adbbaa6075

MALICIOUS

PDF

50.5 KB Created: 2020-08-10 05:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: be8cdd7ab318653c80796a3bcf2e2653 SHA-1: 179deb5a5cbfedf9430d54d0d329f1ae34cc33da SHA-256: 86f387adbbaa607522781baa67df314cb33f1dfbab8e29065cc889b14e7d22c9

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=alternating+series+test+problems+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic content, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=alternating+series+test+problems+pdf
- http://files.compressfirstky.com/uploads/1/3/1/4/131453998/6941965.pdf
- http://files.sarahhobbspoetry.co.uk/uploads/1/3/2/7/132741023/e449cf6dff.pdf
- http://linudu.krutschworks.com/uploads/1/3/1/4/131407067/disuxoni-labolugawamuguz.pdf
- http://files.twcnpc.com/uploads/1/3/0/7/130775490/dikutomif_gasin_fudekujafijuf.pdf
- http://muvasada.djfainphotography.com/uploads/1/3/0/8/130813042/51a2f719.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
- https://cdn.shopify.com/s/files/1/0430/2818/5239/files/35233964967.pdf
- https://cdn.shopify.com/s/files/1/0429/9263/1962/files/76255008129.pdf
- https://cdn.shopify.com/s/files/1/0433/3332/0872/files/33717066414.pdf
- https://cdn.shopify.com/s/files/1/0444/4828/4839/files/disadvantages_of_online_banking.pdf
- https://cdn.shopify.com/s/files/1/0433/2906/1014/files/33227115304.pdf
- https://cdn.shopify.com/s/files/1/0434/2572/6625/files/interview_form_sample.pdf
- https://cdn.shopify.com/s/files/1/0433/4492/0734/files/xumaka.pdf
- https://cdn.shopify.com/s/files/1/0438/6576/8096/files/73023705171.pdf
- https://cdn.shopify.com/s/files/1/0434/3165/7638/files/722469010.pdf
- https://cdn.shopify.com/s/files/1/0437/0448/3993/files/movukowar.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00007304.bin` `7e6f97d42766271c951466bd3276cef9706ba6687e466c6ed480e89754549144`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7304	5280 bytes
`font_01_sfnt_off000084d1.bin` `587020888aebdba239d50d14de9b1009ac2804c519bb8b36684d0fb8269b54a5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x84D1	13040 bytes
`font_02_sfnt_off0000ae73.bin` `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE73	4324 bytes

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