Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70886df389100c0…

MALICIOUS

PDF

44.2 KB Created: 2020-08-10 16:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e716a4dd3f14ac1670a126c764010996 SHA-1: dfa184f15e080ad13bd577fc6a574cdfc650ba83 SHA-256: d70886df389100c011bfc890ac965e8ea9784c158817853fe152a35eeef3487d
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is designed to lure users into downloading further content. The document body, though heavily obfuscated, contains text related to 'Ascendance of a bookworm novel pdf' and a URL that appears to be part of a link farm. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to harmful 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.cc/pify?keyword=ascendance+of+a+bookworm+novel+pdf
    • http://fopafexo.compassionstaffing.org/uploads/1/3/1/4/131438667/lezevowe-fewozo.pdf
    • http://files.relaxthemovie.com/uploads/1/3/0/7/130775257/mikazogirezugu-darimegumek-fiman-zizupenivirebon.pdf
    • http://files.ppmglobal.services/uploads/1/3/0/7/130740432/bavobowisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/fezibotevexigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/atualidades_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/sagozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/30830407444.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/domuzepelesumikojiligir.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/best_paint._net_plugins.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0434/3365/6476/files/auditing_and_investigation_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/argentina_country_profile.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/xifegavemujituluvizidof.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_off000064a3.bin
85a854d7b9b701c48fd79b42f7d3f4c93759699a1d9b74c1db07cd1d16085a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A3 5644 bytes
font_01_sfnt_off000077cd.bin
b8d2478faae2eca482cd8a3867e8b400e4ff875c4a97f3f3d5e97741070c0ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 14148 bytes