Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba4dd80943fb1d2…

MALICIOUS

PDF

49.1 KB Created: 2020-08-09 03:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d456729883cae18a5693bb6809c74af1 SHA-1: e3b3d89958403066026c32e7eaf5e9f658fc0294 SHA-256: 5ba4dd80943fb1d2d0e40a537e1d6c444d500ddbdd505b970c6f94a4d697a85c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded content, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign. No scripts were extracted, but the presence of numerous links suggests an attempt to direct users 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.cc/pify?keyword=barrier+free+environment+in+schools+pdf
    • http://files.wastelessjewelryandcompany.com/uploads/1/3/1/4/131454373/72e9ae.pdf
    • http://files.sbcdallas.com/uploads/1/3/0/8/130814535/6ac85.pdf
    • http://files.raisingtheskirt.com/uploads/1/3/0/8/130813320/1022002.pdf
    • http://files.4activelife.com/uploads/1/3/0/8/130814021/164229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/pdf_file_reducer_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/15324205887.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/38589480130.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/46449317816.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/36804749945.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4392/files/mrityunjay_kadambari.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/john_deere_ztrak_757.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/61008531090.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/libros_para_superar_la_ansiedad_y_depresion.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/35902184091.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/formal_email_writing_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1703/files/fasepenujuwilapot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/cal_spa_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/20586056624.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007476.bin
35bf7b3ae834867448ccfd138d20d644a3915e85e75b692e5cb3a64a653fa30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 5292 bytes
font_01_sfnt_off0000864e.bin
07de3dd9abb794f3421be3d2299aeedf5e1f45027d092ad4c2baf889e00ffb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 10016 bytes
font_02_sfnt_off0000a8b6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B6 4324 bytes

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