PDF malware analysis — malicious · 92090b33972b0f76

MALICIOUS

PDF

34.7 KB Created: 2020-08-01 10:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e6d069d6848165341b27a62d9207f390 SHA-1: 494dd4d57559f06eebdb914bd49ecc60cb0f62d5 SHA-256: 92090b33972b0f76b79195b350f15dbfb3877799f567f30b07078003e4f2f0a1

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link to a redirector service, which in turn points to a "link farm" of other PDFs hosted on Shopify. The document body text, though heavily obfuscated, contains keywords related to downloading a specific textbook, suggesting a lure to trick users into downloading further content. The primary malicious indicator is the PDF redirector link, which is designed to lead users to potentially harmful content.

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=griffiths+electrodynamics+4th+edition+pdf+download
- http://files.littleladyo.com/uploads/1/3/0/9/130969004/furopigolijur.pdf
- http://files.fvapbotb.com/uploads/1/3/2/6/132695354/6868215.pdf
- http://files.houstonhighschoolptso.com/uploads/1/3/1/3/131398052/79434e289cba3.pdf
- https://cdn.shopify.com/s/files/1/0434/4043/9446/files/xedujixe.pdf
- https://cdn.shopify.com/s/files/1/0431/8789/6488/files/43165881875.pdf
- https://cdn.shopify.com/s/files/1/0431/6377/9240/files/84609164568.pdf
- https://cdn.shopify.com/s/files/1/0428/2118/9788/files/38677205522.pdf
- https://cdn.shopify.com/s/files/1/0430/6714/6397/files/lajerutuda.pdf
- https://cdn.shopify.com/s/files/1/0435/8003/1135/files/pupevefinogesif.pdf
- https://cdn.shopify.com/s/files/1/0429/8683/2035/files/27258958324.pdf
- https://cdn.shopify.com/s/files/1/0434/3093/6733/files/duvufivukira.pdf
- https://cdn.shopify.com/s/files/1/0437/7234/6526/files/zosusirenexojasinabezi.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_off0000490d.bin` `bd735b667bab73266998271daf9959c9f8ba11bb461f687add630b63286bb406`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x490D	5708 bytes
`font_01_sfnt_off00005c6f.bin` `08459fe58ab3f2f4e5c7050725bf91122d54ceee1e5b8b24db9958191b0f7f50`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C6F	9792 bytes

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