Malicious PDF — malware analysis report

Static analysis result for SHA-256 1985c2d725a4f141…

MALICIOUS

PDF

57.8 KB Created: 2020-08-09 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f728bb7eb0b5c9858b54a535710e39f SHA-1: 31a3abf50d1ab8a397aad8ce2174bdc582446188 SHA-256: 1985c2d725a4f1412cf12e5821c0f1036eae9428d2b539bce02323d71970c6e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=interpretacion+electrocardiograma+enfermeria+pdf, is flagged as a malicious redirector, indicating the document's primary purpose is to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=interpretacion+electrocardiograma+enfermeria+pdf
    • http://files.cvpeyamaha.com/uploads/1/3/0/7/130740563/bemorosafavi.pdf
    • http://files.woodstockumc.org/uploads/1/3/2/7/132740187/dogejo-fepako-gosesibubeloka-dekem.pdf
    • http://files.themoundcityslickers.com/uploads/1/3/0/7/130739263/11ebb56ab76ff.pdf
    • http://labeg.ibelieveinbirth.com/uploads/1/3/2/6/132682646/tumopave.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/migazisajujuvuguzujedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/15494964647.pdf
    • https://cdn.shopify.com/s/files/1/0449/8790/8264/files/apicultura_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/hebrew_english_transliterated_bible.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/kesibefamazofeno.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/naduxategalelibejuviwumif.pdf
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/bexoripirazuvot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/1526123691.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/rofadali.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009318.bin
31c540d11144f4345156f451af9ba389a1131d21873ea1c3280cece25ef53112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9318 1872 bytes
font_01_sfnt_off00009c0c.bin
c015c4754e9298e05c577c4eb9d1e5cd5510de9e37e46febec26f5c8d1f29a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0C 5232 bytes
font_02_sfnt_off0000adc4.bin
da0ca65277e1aa8ca63d7535a46047d9c12dc9e0bc8a092af8e4afebddcac2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC4 13816 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.