PDF malware analysis — malicious · 91d1e003bdf8c53c

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e8037655f39bb54090e7bcca3d78c3f1 SHA-1: 3ee0a9599307c075439752794cb743c7f340c3c2 SHA-256: 91d1e003bdf8c53cd5536bb1db173fa1ac38ca01ae227930b254488dc1dfb15b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that leads to a link farm of other PDFs, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL and the document body both point to the same malicious redirector. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=puzzle+questions+with+answers+in+english
- http://files.kathleenmarchetti.com/uploads/1/3/0/7/130739275/8454044.pdf
- http://files.juliaandjustjulia.co/uploads/1/3/2/8/132814030/5182201.pdf
- http://files.jesupwscottalumni.org/uploads/1/3/2/6/132695915/xumeronopi.pdf
- http://files.cynthiastarrheartspeak.com/uploads/1/3/0/8/130814298/lunedil_bedimowapeter_didoje.pdf
- http://files.universitystemacademy.org/uploads/1/3/0/9/130969915/sedopomekexute-vosivuzadilet-niximunid-subulumiwadurek.pdf
- https://cdn.shopify.com/s/files/1/0436/8950/9017/files/90008740567.pdf
- https://cdn.shopify.com/s/files/1/0435/2117/9816/files/rowatironegokuriwoteruwu.pdf
- https://cdn.shopify.com/s/files/1/0433/3902/2485/files/jelajolulovozug.pdf
- https://cdn.shopify.com/s/files/1/0434/4253/6598/files/36968031072.pdf
- https://cdn.shopify.com/s/files/1/0429/6550/0060/files/the_bogleheads_guide_to_investing_espaol.pdf
- https://cdn.shopify.com/s/files/1/0428/7211/1260/files/litox.pdf
- https://cdn.shopify.com/s/files/1/0431/3707/3314/files/98056370841.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000655e.bin` `602f6304db088f6337adf45f954d23f4dfb7d2bed47d8b5214568be64e2a13b3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x655E	5216 bytes
`font_01_sfnt_off0000772a.bin` `1db8eae992d9c2d3dc7792d2e9ac607bc704b0bd805d82ffe01765ff3c205ba5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x772A	10452 bytes

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