PDF malware analysis — malicious · 721d15b96f3c75e8

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 18:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 08ce2593c44f76577c38112160b59a3a SHA-1: 613712acb3f9aaba405801812bdcd7123f3f36f1 SHA-256: 721d15b96f3c75e81b57f40c03c89b3e63b80cf45bb4bb641b5faa8bb5ccf26a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet answers' document, a common lure for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.me/wix?keyword=identifying+theme+practice+worksheet+answers
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/d4a9d6_8ec83749843d4e2293554fe253b8957a.pdf
- https://static.usrfiles.com/ugd/5438e3_cc8e7fb1e690448282478914406dd463.pdf
- https://static.usrfiles.com/ugd/33a16d_da937b31a0d741db9abd82212cc00853.pdf
- https://static.usrfiles.com/ugd/76de1a_20b2bfe6a1d44435801061acb4692537.pdf
- https://static.usrfiles.com/ugd/16a96a_c164fdd94b064921ad1022345cb70c93.pdf
- https://static.usrfiles.com/ugd/eaf48f_f368e6cc5c8b4c2188d4d94764569d61.pdf
- https://static.usrfiles.com/ugd/de02f3_12095a66f7024721ace87fffbc200af5.pdf
- https://static.usrfiles.com/ugd/9219f8_690c4173bc2b4003b0c7b1e83c8ccd67.pdf
- https://cdn.shopify.com/s/files/1/0431/2884/8538/files/14724653058.pdf
- https://cdn.shopify.com/s/files/1/0435/2491/5359/files/basic_russian.pdf
- https://cdn.shopify.com/s/files/1/0431/3654/9018/files/60209402935.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005bdd.bin` `cad5c287dd8e84c2c90b4ad94b2496ec0731d584f8492b2c4a9d2c7b5e1b172e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BDD	5732 bytes
`font_01_sfnt_off00006f52.bin` `3cfbd5176168748dcdaf61e29f5414b5cf078869e7a38f11e162488cf2ef31e3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F52	10364 bytes

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