Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3305929e22d8a35…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 08:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32faf9595ecd31cd6c67bca1f929178 SHA-1: 77450ed27f9e6d922b2f3dc08d3216f602bb6e0f SHA-256: c3305929e22d8a35a871944259723e06632a063916616ddf774c1d94f0f43d20
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://ttraff.ru/pify?keyword=atresia+esofagica+tratamiento+pdf, which is flagged as a malicious redirector. The document body, though partially obfuscated, contains text related to medical treatment, likely serving as a lure.

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.ru/pify?keyword=atresia+esofagica+tratamiento+pdf
    • http://tovasol.pubquizprep.com/uploads/1/3/2/6/132682327/2394672.pdf
    • http://zibiti.athensprep.org/uploads/1/3/1/4/131406390/15b39db0682ab.pdf
    • http://files.socialstudiesunited.com/uploads/1/3/1/3/131397973/vadaxovaxosuwevusegi.pdf
    • http://xelubo.thelightingsummit.com/uploads/1/3/1/4/131454024/3369954.pdf
    • http://files.ammosfilms.eu/uploads/1/3/0/7/130738792/xijavadokogafuguwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/66262364407.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/sinafuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/96188182377.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/92312767140.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/vabowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/reliance_balance_sheet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/tunakodavowakaremixumom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/disociacion_auriculoventricular.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/tm-_ac1900_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/gubomagoxobisunoxizusiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3437/files/vidututojejejexajodizaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/52395020246.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/wonixidinupofu.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_off000069ad.bin
9e4d3d7f524c2cece8ba50e634ba13a56c0fa959216c07d16ab2b28185f8e0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AD 5432 bytes
font_01_sfnt_off00007c18.bin
440a05baf473e27e8e17b840bbac2e0b0b05760e751eae17cc0c1971514d17b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C18 10192 bytes

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