PDF malware analysis — malicious · 4c73634d2c8deaa1

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 13:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cfb1250cda1be527d09fac73e93bd70d SHA-1: fbc105731a0ada96c2073bfcf552e7d381c71587 SHA-256: 4c73634d2c8deaa162392d8ca91ebd706e25e83124c893af33876b3246f06bb4

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, also contains this URL and mentions 'Calligraphy name art app', suggesting a lure. The presence of a large number of external PDF links, many hosted on shopify.com, indicates a link farm strategy, likely to obscure the malicious redirector.

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=calligraphy+name+art+app
- http://files.refreshingmercies.org/uploads/1/3/1/8/131858044/6923308.pdf
- https://cdn.shopify.com/s/files/1/0437/9462/8769/files/color_street_catalog.pdf
- https://cdn.shopify.com/s/files/1/0432/3557/3919/files/daselafipigasesiset.pdf
- https://cdn.shopify.com/s/files/1/0431/7180/7396/files/active_and_passive_voice_tenses_rules.pdf
- https://cdn.shopify.com/s/files/1/0436/1977/8720/files/administracion_de_recursos_humanos_libro.pdf
- https://cdn.shopify.com/s/files/1/0429/2945/5271/files/14080738605.pdf
- https://cdn.shopify.com/s/files/1/0430/9411/4465/files/58296271834.pdf
- https://cdn.shopify.com/s/files/1/0429/1274/3580/files/lorifuwiluf.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
- https://cdn.shopify.com/s/files/1/0433/1785/4373/files/68243356447.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_off00005952.bin` `4e62ac8660b14adf42fb54d65f7823cb1a591cd09133ac0dca74a835dc27db82`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5952	5060 bytes
`font_01_sfnt_off00006a65.bin` `4284e0b40c4a249003f68b7f1cca442420decd092149e41794007421b4d2898b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A65	10016 bytes
`font_02_sfnt_off00008cdf.bin` `e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CDF	16092 bytes

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