PDF malware analysis — malicious · 1fe4cb25ee486284

MALICIOUS

PDF

43.5 KB Created: 2020-04-30 04:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: fdef49640f64c87382defd10c01ed938 SHA-1: ebd7deb0600477df038d105d92cc2a081b6238f8 SHA-256: 1fe4cb25ee4862843ddfd44dbe0767be729a2ecab41963dd024a3bbcb73a1d2c

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to numeric slugs, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body text is heavily obfuscated and contains references to URLs, suggesting the document's primary purpose is to redirect users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
External URI info PDF_URI

PDF contains an external URL action
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 http://referral360network.com/uploads/1/3/0/3/130379231/130379231.html#the+categorical+syllogism+logic+exercises+answers
- http://fundamenton.com/uploads/1/3/1/4/131407802/wotafujajolexubavede.pdf
- http://remiemichelleclarke.com/uploads/1/3/0/4/130435701/c5fa020437b129.pdf
- http://bluesbreakercottage.com/uploads/1/3/0/4/130490421/774e5a34f45.pdf
- http://homeschoolingsource.com/uploads/1/3/0/9/130969216/kuzuxuju-gamadavovon-gevizew-mipawikuduv.pdf
- http://atrickortwo.com/uploads/1/3/1/4/131455956/xawibulami.pdf
- http://firsttimeinkenya.org/uploads/1/3/0/8/130814070/097892ac9.pdf
- http://meganwesterveltfloraldesign.com/uploads/1/3/0/7/130739379/pekofodaxuna-xepokapoxu-zufozizusonelen-dawowasoz.pdf
- http://customcreationshou.net/uploads/1/3/0/4/130435722/fb80998c2da.pdf
- http://teamsellkey.com/uploads/1/3/0/5/130551880/zoxafufej.pdf
- http://kanopy.store/uploads/1/3/0/4/130435898/parafamubewisagil.pdf
- http://daturafashion.com/uploads/1/3/0/3/130323455/4d322b2c19a42b6.pdf
- http://yourcreditmanager.net/uploads/1/3/1/4/131438280/32c690eec456458.pdf
- http://snakeriversecurity.com/uploads/1/3/1/3/131380177/jijifiwa-futabilebevunib-xelokaravexofad-xopolelefov.pdf
- http://biozantium.com/uploads/1/3/1/4/131452800/9834539.pdf
- http://dentonstuccocontractor.com/uploads/1/3/0/5/130590432/sikemebuvevebariwa.pdf
- http://firsttimeinke
- 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_off00006db2.bin` `b5e32ededa5e1336ebd4ae456052d11e64e6a306799e6afa603f08cbb5bb94cf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DB2	7624 bytes
`font_01_sfnt_off00008b82.bin` `f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8B82	16204 bytes

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