Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc1e7c99c8630a…

MALICIOUS

PDF

64.0 KB Created: 2020-08-09 03:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f18c2b8e754f5f852e85436fe78140d9 SHA-1: 4665c6eadf1bca89145b411748be8e25ca8aaf47 SHA-256: 39bc1e7c99c8630a22e2a31923c0b129f3c80c37ef3086d4ca3717b18a26a274
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Psychological assessment journal pdf' and the malicious URL itself. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users 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.ru/pify?keyword=psychological+assessment+journal+pdf
    • http://files.wanderlustcamperco.com/uploads/1/3/1/3/131380292/f5901ccd2a44.pdf
    • http://mamufodip.operationhood.org/uploads/1/3/1/3/131384429/tuxegupunu-davefupikabazed-fomon-damokemelom.pdf
    • http://wiletu.malbeads.com/uploads/1/3/2/8/132814930/detugedoka.pdf
    • http://tozajawor.defnepansiyon.co.uk/uploads/1/3/1/8/131872225/3298335.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/pawupivewosexum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/guromuzamudajer.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/weight_loss_diet_chart_for_female.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/56211403856.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/pemotilapafogozadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/velema.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/jugukematazasifapugimofup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/49007382432.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/fasciola_hepatica_morfologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/introductory_chemistry_lab_manual_corwin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/xamuto.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_off0000b2f2.bin
ee698d9e5119b05a342897b514344a1ea5372a3fe209333e4b254810f9b11e08
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 5748 bytes
font_01_sfnt_off0000c664.bin
598559e25135c510a95013c9a03ae37651176ec82472c673e8d38cdc5d755573
pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 13928 bytes