Malicious PDF — malware analysis report

Static analysis result for SHA-256 9887e2e070894b2f…

MALICIOUS

PDF

43.1 KB Created: 2020-07-26 10:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 120c41e250053ff60f22e4262807aa6e SHA-1: 27b5c402ad1c8c3d9e08050b7cd204a86971d48e SHA-256: 9887e2e070894b2f67d188349c791ac7558bc44253d8e0fb1b629dcca22713ca
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/pify?keyword=accrual+to+cash+adjustment+worksheet', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to financial worksheets, 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.cc/pify?keyword=accrual+to+cash+adjustment+worksheet
    • http://files.threelyonscreative.com/uploads/1/3/0/7/130776065/ed0e7.pdf
    • http://files.thaliaestrella.com/uploads/1/3/0/8/130814176/dobijuzi_zosuxaleribe.pdf
    • http://files.llanorocknriverfest.com/uploads/1/3/0/9/130968949/1350482.pdf
    • http://files.a1412531xstreamtravel.xsideas.com/uploads/1/3/1/0/131070294/4bce322993e.pdf
    • http://files.woodbinefarms.com/uploads/1/3/0/7/130776641/zifedelafa-karaxapurovurat.pdf
    • http://files.woodbinefarms.com/uploads
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83390791822.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/53099926007.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/72346814363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0134/files/nosetalizuwajawulotira.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/82049597473.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/putatorolarur.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/89107333855.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_off00006c12.bin
250d568ab9adf377c6b17eeff58ea3ed6bab1f3bf6344ba0edaffb6e41131b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 5232 bytes
font_01_sfnt_off00007dc5.bin
329c61067f7af77c7d3ca20ef56868df201f5a258a1ed568dc69b5cfcff4a161
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 9860 bytes