Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9b42e2610497e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-15 21:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5658e811cdc3394b41b7f291cf1c05aa SHA-1: 76ec62ba3e93045d78d3588df8b22783e4114e28 SHA-256: 5eb9b42e2610497e6b7ffee3b80e8efd75e36b0db1ca49b4424a8569b9a0a999
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'consistent system of linear equations examples pdf' and includes a URL pointing to a redirector. This suggests a phishing or scam attempt, likely using the document as a lure to drive traffic to malicious sites.

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/wb?keyword=consistent%20system%20of%20linear%20equations%20examples%20pdf
    • http://files.eldersdailymeditations.com/uploads/1/3/0/7/130776828/faxebatebevetami.pdf
    • http://genarusij.honeypotcreativecafe.com/uploads/1/3/2/6/132680903/7716237.pdf
    • http://files.patestos.com/uploads/1/3/1/3/131381003/radezeparenonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/145877678.pdf
    • https://cdn.shopify.com/s/files/1/0432/7053/7374/files/lijepovegupekudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/askep_hernia_inguinalis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5543/9263/files/sudivakotepupaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/murogiforuwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/lerawajoxapomulerugujaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/bufedazezegagal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/1906620925.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/commodore_64_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/30340167587.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_off00005bac.bin
2f3d347fa32c77211aee8954e215561d831bdde0e5d21026704780b9140d884c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAC 5388 bytes
font_01_sfnt_off00006deb.bin
e5ce59aa55914bb31611ab71d5b1814b2b5cdc13e00aed629be3d3bd03e8e68e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEB 13268 bytes