PDF malware analysis — malicious · ba9cb387a429f39a

MALICIOUS

PDF

56.5 KB Created: 2020-09-08 07:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b0c09dd16436d6f09766db1255b22875 SHA-1: 4e584ccae770d808e42a6aa187c44692b2251bf0 SHA-256: ba9cb387a429f39a264102b07fcb5f8cda5b07cd245b0ed4d97396a4a90c3a9e

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, likely for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at ttraff.club, which is further supported by the document body containing the same URL. This suggests the primary intent is to redirect users to malicious infrastructure under the guise of providing TOEFL reading comprehension materials.

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.club/wix?keyword=toefl+reading+comprehension+passages+with+answers+pdf
- https://cdn.shopify.com/s/files/1/0462/6389/4173/files/gallbladder_diet_spanish.pdf
- https://cdn.shopify.com/s/files/1/0470/9299/0110/files/the_laundromat_2019_parents_guide.pdf
- https://cdn.shopify.com/s/files/1/0433/2499/7800/files/nopat.pdf
- https://cdn.shopify.com/s/files/1/0462/6884/2146/files/hemoptysis_symptoms_merck_manual.pdf
- https://static.usrfiles.com/ugd/89602e_450c1632ccb8465b8562cc5438029c23.pdf
- https://static.usrfiles.com/ugd/64f9d2_64b0dd2417ee4a9b9663be1c593382ad.pdf
- https://cdn.shopify.com/s/files/1/0463/0252/7645/files/fawizep.pdf
- https://cdn.shopify.com/s/files/1/0431/7682/0890/files/nanofewi.pdf
- https://cdn.shopify.com/s/files/1/0437/0500/8293/files/23892797126.pdf
- https://cdn.shopify.com/s/files/1/0432/5556/2398/files/wijamugukefovakegotu.pdf
- https://static.usrfiles.com/ugd/d8966e_9a0f79d6ca484a278a88b74ae3f70fab.pdf
- https://static.usrfiles.com/ugd/2f7815_4a5547f8b14344969cddfdb835623ddc.pdf
- https://static.usrfiles.com/ugd/5de1df_0eeed2f981ed4dc386e8757e343a4cad.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000080ed.bin` `34a8226dd98ce5eefc7749a1b6195d26c3c1d2d7dc2d495162dfbe5e51b57151`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80ED	5612 bytes
`font_01_sfnt_off000093e5.bin` `e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x93E5	1800 bytes
`font_02_sfnt_off00009c73.bin` `7382ded0f22a6b03b5c72d407a8e5c16f2879e71e5057805c4d49c88a94c8ac6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C73	10096 bytes
`font_03_sfnt_off0000bf34.bin` `18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF34	16144 bytes

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