Malicious PDF — malware analysis report

Static analysis result for SHA-256 15569961caade66c…

MALICIOUS

PDF

68.2 KB Created: 2020-07-31 14:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecc6bf9098742d9432af7d013ed0001 SHA-1: 022705ab1f89647a73bf3ff9d2378cfd60f83eb4 SHA-256: 15569961caade66c0fe31c516470bb69bf846a34146127f44bedd884f5e2516e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or lure users to malicious sites. 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.com/pify?keyword=complex+numbers+pdf+sakshi+education
    • http://files.buckade.com/uploads/1/3/1/1/131163669/toboda_lebosuziwerajen_jariwaninewubu_lovewizadan.pdf
    • http://files.snowbc.org/uploads/1/3/2/6/132696512/wekesifojuzewavope.pdf
    • http://files.lisasymondsfitness.co.uk/uploads/1/3/2/8/132815008/31b367ce1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/33253489502.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/xegigutegiketadaratezavoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xazome.pdf
    • https://cdn.shopify.com/s/files/1/0435/4942/5823/files/memiworodamupofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/58221348903.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6732/files/36601125733.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/nunovoduvozisepiwajafovez.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/diwabaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rofimoluxita.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/81895469723.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/pagajijawadugimedesabelis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/zevonanugorapif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/poparopetuga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e0.bin
1b8037843ce18cd801e622ac38fcba6080ade92b7182883db181ca8770311e87
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 5572 bytes
font_01_sfnt_off0000d9a0.bin
04dd7d451f8b7175280d2366175aa84f71a5290ce7b2981d859b8d072323ab01
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 13648 bytes