Malicious PDF — malware analysis report

Static analysis result for SHA-256 538f942324ced4e5…

MALICIOUS

PDF

43.2 KB Created: 2020-08-10 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ea174d11861ac9089261b631e5799a2 SHA-1: ebe946166617ff08d4960a371e8e749d4328c0a5 SHA-256: 538f942324ced4e571fa7f3a595728cbfd1cc1e2de7e4d42bbffa59f34f55afa
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body contains text related to 'Ecocardiografia cardiaca pdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external links, many hosted on Shopify, indicates a link farm strategy to distribute malicious content.

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=ecocardiografia+cardiaca+pdf
    • http://files.coryskurdal.com/uploads/1/3/0/7/130776265/4617042.pdf
    • http://files.taracarpenterart.com/uploads/1/3/0/7/130739780/xogipunak-wobovoladodowo.pdf
    • http://files.thoughtfulfilmrants.com/uploads/1/3/1/3/131398605/pezejapumenij.pdf
    • http://jutamum.icanbirth.com/uploads/1/3/0/7/130776485/87e0b697f.pdf
    • http://files.globalphonetools.co.uk/uploads/1/3/1/0/131069887/67efe5e8bd23.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/siniga.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/nutuzutonoravagomorebejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8793/8211/files/juwopijivufetesir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/84431927414.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4319/files/56662945370.pdf
    • https://cdn.shopify.com/s/files/1/0440/2590/5317/files/biological_causes_of_schizophrenia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/99260922154.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/74881808783.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/33667615563.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/77957780032.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/wedotuvasejilugobabuxixow.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/40636773016.pdf
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/12527802324.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/faringitis_aguda_bacteriana.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_off00005eb9.bin
0be853829fe42fd6a45917351e002f559eabaaf1a97170b501bbe8b26d04fe42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB9 4556 bytes
font_01_sfnt_off00006e3e.bin
dc282b8cb650e81f6e0285a02a7d1cc0d17bbf08b9fcdae2911b7112ace31363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 10908 bytes
font_02_sfnt_off000091c5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C5 4324 bytes

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