PDF malware analysis — malicious · a3c722e6e02f8fef

MALICIOUS

PDF

45.0 KB Created: 2020-09-02 02:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d83c9014c9aeb232bda84e7059d74495 SHA-1: 7a0f1358854cabf66567800c6f9fe2459876ce12 SHA-256: a3c722e6e02f8fef577ccafb088a9849be12d9911fa2d17c841419f6c321234e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and contains embedded links, reinforcing the malicious intent.

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.cc/wix?keyword=ball+bearing+nomenclature+pdf
- https://static.usrfiles.com/ugd/8b2c09_b491866dbe734c5d931edfbe1926926c.pdf
- https://static.usrfiles.com/ugd/73f3b0_d115b8ce8bea4c6a941f7c484f93ada8.pdf
- https://static.usrfiles.com/ugd/5de1df_f11580e1a15849aeb2c89ad3571b367e.pdf
- https://cdn.shopify.com/s/files/1/0430/8343/2096/files/gutakotino.pdf
- https://cdn.shopify.com/s/files/1/0433/3830/1594/files/parabolic_dish_antenna.pdf
- https://cdn.shopify.com/s/files/1/0440/6339/1894/files/33813061485.pdf
- https://cdn.shopify.com/s/files/1/0460/5755/4075/files/evidence-_based_medicine_guidelines.pdf
- https://cdn.shopify.com/s/files/1/0434/8693/7248/files/anemia_de_celulas_falciforme_pediatria.pdf
- https://cdn.shopify.com/s/files/1/0431/5296/5789/files/75724435742.pdf
- https://cdn.shopify.com/s/files/1/0428/2961/1171/files/37519897865.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005b79.bin` `57e0cdd5ac406d96a661441cc641e6a2ab985248d948af3548ec2a110f64a974`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B79	5368 bytes
`font_01_sfnt_off00006d95.bin` `5b281a55dfdf3c524c502e38365998f9963992442104f25c98b2b76d62fbd48c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D95	13924 bytes
`font_02_sfnt_off0000996a.bin` `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x996A	4324 bytes

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