Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc831a2714529d4…

MALICIOUS

PDF

51.0 KB Created: 2020-08-05 22:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f44263a35831b0eb52e7b61b0b36535 SHA-1: c72dddeb92e8e31263cc78f05dedf824544e6c69 SHA-256: 0bc831a2714529d4d52cf0eda3fc9c7229d0c9c0d9363016ba3c83f36973a3eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'financial statements'. The presence of a malicious redirector link indicates an attempt to lead the user to a harmful destination.

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=estados+financieros+ejemplos+pdf
    • http://files.fafcookbook.com/uploads/1/3/0/7/130738871/gujeseporabe.pdf
    • http://files.seliasomething.com/uploads/1/3/1/3/131383737/4508014.pdf
    • http://files.spanish-expressions.com/uploads/1/3/2/6/132682070/1674864.pdf
    • http://nagar.nhcss.org/uploads/1/3/0/8/130814238/dabatepa-vixujejabufas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/nosuwujujijusinalix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/fadejosefezavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/parental_attitude_scale.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/52583168123.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/3dcrafter_3d_modeling_software.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/90595163342.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2839/files/7597023816.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/pefitotamanebepogivapixa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/xogoxagujip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/98325981697.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_off0000850e.bin
0461da32a36ee9181c8c475a2c7d355ba8c4c72a8051fd4527d2b7e808ca7393
pdf-font-stream PDF embedded font (sfnt) at offset 0x850E 5336 bytes
font_01_sfnt_off00009728.bin
17bd4a9b086271455e7fa343e5e2eca42cc9847e3af034f58da5021570e17cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9728 11756 bytes