Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b4484de99f1586…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 18:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d35ee1f7e9314942a7e39bed0ce7c6 SHA-1: 40abefac81182abf10679e68bb99364114c583f6 SHA-256: 83b4484de99f1586ad294ebf97f471c2b2ffaeccaf00695253e5763bbcd06ae5
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=information+sur+le+biodome+de+montreal', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a mix of metadata and what appears to be a reconstructed URL, suggesting an attempt to disguise the malicious intent.

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.ru/pify?keyword=information+sur+le+biodome+de+montreal
    • http://kebejulu.heavensentpopcorn.com/uploads/1/3/1/8/131871991/viburel_vagagifedot_zisevas_sajezinefu.pdf
    • http://zunigirow.balletbeats.co.uk/uploads/1/3/0/8/130874082/wopewubakideju.pdf
    • http://files.karenfang.com/uploads/1/3/1/0/131069789/kepimuzum_leban_tofojox.pdf
    • http://jegubu.matharteducation.org/uploads/1/3/1/8/131858419/guzeku.pdf
    • http://files.peterfekete.com/uploads/1/3/1/3/131383621/xizapumufuvam_sezobogawi_sebozizuwujus_vodojunumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9292/6883/files/cervical_cancer_risk_factors.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/angina_de_ludwig_caso_clinico.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/rokarilubulakijuxogizuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/zewebupevuwamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/sudeduwizidugamodukarin.pdf
    • https://cdn.shopify.com/s/files/1/0435/0853/1365/files/bcbs_of_texas_provider_manual_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/39739779510.pdf
    • https://cdn.shopify.com/s/files/1/0434/8755/9833/files/86010209628.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/9538938375.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/goodman_gmp075-_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/miocardiopatia_hipertrofica_dilatada.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3834/files/administrao_da_produo_e_operaes_krajewski.pdf
    • https://cdn.shopify.com/s/files/1/0450/5206/7998/files/latex_absolute_value.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d0f.bin
af7de699a372ef7781d4699d29e67d4d90a00d7d25ad2756f7f1db1c18c1309f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0F 5132 bytes
font_01_sfnt_off00007e59.bin
a53208e4c2a380cb4625efa49e21d33ae2e188ed613a748dd4270ed6d487493a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E59 12364 bytes