Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd6e5fd0aefc34…

MALICIOUS

PDF

48.7 KB Created: 2020-08-18 14:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0400afdbd83f96f74ad99cd20ad8373 SHA-1: cadd1bf0f4dc11221d15d9ac95f767fd334ceff4 SHA-256: 91cd6e5fd0aefc345fc01f1704071ace678bc8278ffdfe595b9b6990fbc5b8b0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented within the document body, disguised as a payroll calendar template, indicating a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the true malicious 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=2016+biweekly+payroll+calendar+template
    • http://sikajasif.workingwordsproductions.com/uploads/1/3/2/7/132710714/6834442.pdf
    • http://nejan.barbara-sonner.com/uploads/1/3/1/4/131437594/bisedo_somuvugexepug.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/frozen_shoulder_physiotherapy_management.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/89295749819.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/81925683254.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/34458487311.pdf
    • https://cdn.shopify.com/s/files/1/0450/3601/1678/files/apple_developer_program_profile.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/zte_z223_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/drop_down_list_excel_using_different_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/fishing_report_oregon_coast.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegofegomena.pdf
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/brief_summary_of_the_bible_from_genesis_to_revelation.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/25108762058.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/badrinath_full_movie_telugu_hd.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/
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/8929574

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007db2.bin
5e0c44f974cf6a21f77117e4349bbd7d6276efda14fc6166120f8dca00314a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 5824 bytes
font_01_sfnt_off00009174.bin
0eed043efe44cb9e0e01dd8320a53d149ea8bbbd77cb54d28cbe9e5243d87035
pdf-font-stream PDF embedded font (sfnt) at offset 0x9174 10536 bytes