Malicious PDF — malware analysis report

Static analysis result for SHA-256 628c3ed1449b44fd…

MALICIOUS

PDF

45.0 KB Created: 2020-08-15 01:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ecda15f932ab761544cc3e77d6a95ce SHA-1: ff7ab57b7cb6f35a1bc162325261628659ce20ac SHA-256: 628c3ed1449b44fd7cccd4c77e64bdf198c6bcbe1edf19f5d5979471e6edac1c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a book download. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or malware distribution attempt. The PDF also contains a link farm pointing to numerous other PDFs, likely for SEO manipulation to increase visibility of malicious 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.cc/pify?keyword=livros+de+brennan+manning+em+pdf
    • http://kojaf.landinarizona.com/uploads/1/3/2/3/132303382/8464357f05fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7587/0630/files/20511689415.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/tutorial_adobe_premiere_pro_cs6_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/vudonujiferelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3528/6943/files/movie_box_for_macbook_pro.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/liduzerexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/24329500546.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/werasek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/23978741880.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/tajonuxulobovutukobasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/adjectives_worksheet_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/94792236359.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/kilajelopedoxegowogewive.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/radio_shack_electronics_learning_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/napuwadomu.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_off00007049.bin
b308b326e4b73c06af4fe6f5703d91b68799d6ee51bb614e98065a6fc64e6930
pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 5472 bytes
font_01_sfnt_off000082d3.bin
3bde7e596ed054e74b9a40e5df23b61977fdbf61cbdf0d08f76547974f8db9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D3 10744 bytes