Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fa61fa96e9b7b7…

MALICIOUS

PDF

54.2 KB Created: 2020-08-12 04:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c8fbf324fa3e5cc1dbf42a445f135b8 SHA-1: 82365cd3310506bad912b6c4490f854f932b0560 SHA-256: a3fa61fa96e9b7b750971641d9c3bba910f5780b6e711bb4674d5a685e5d6458
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=atmosfera+estandar+internacional+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify-hosted PDF links, suggesting a link farm designed to attract traffic. No scripts were extracted from this sample.

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.ru/pify?keyword=atmosfera+estandar+internacional+pdf
    • http://files.uofaasce.com/uploads/1/3/2/6/132682040/kogefojuzonera_dopituw.pdf
    • http://files.lamaisonneuve.com/uploads/1/3/0/8/130814208/89e0cb44.pdf
    • http://vidatefuf.bjeweledboutique.com/uploads/1/3/1/4/131438464/miperejesakeba.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/45111299623.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/xamaxe.pdf
    • https://cdn.shopify.com/s/files/1/0448/2488/7456/files/clinical_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/56800567078.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/86636239016.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/80060569714.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/74614821861.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/valores_normales_de_bilirrubina_en_sangre.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/gunekoxigulubiwefiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4882/files/3632167620.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/learning_guitar_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/30721152378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.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.

FilenameKindSourceSize
font_00_sfnt_off00007265.bin
9a4134f61999442bfed72ba425bb1bd67f08afdfd16a57380a762364a16296bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 5288 bytes
font_01_sfnt_off00008446.bin
a5740ba74af0610ca317d26333106dc43393b76641ba67b2fc956e853ac08a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 16184 bytes
font_02_sfnt_off0000b564.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 16060 bytes