Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d3a3569e19aa1b…

MALICIOUS

PDF

86.5 KB Created: 2020-08-30 07:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c63d7f44bd5adaa7af34890c21bd28d SHA-1: a1824ccf4d72eb527aae7dfd245801d5dc64b6d5 SHA-256: 61d3a3569e19aa1bbb7029f6386f6e46dcf44fdceff8f62e29388192381227f7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=geologien+p%25C3%25A5+ringerike'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. The ML classifier also strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, appears to contain a URL that is likely intended to lead the user to a malicious site, potentially for phishing or malware distribution.

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.club/wix?keyword=geologien+p%25C3%25A5+ringerike
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8f75cbe2ef9d4d4c8938b6be3df69f31.pdf
    • https://static.usrfiles.com/ugd/ae059d_5fe10f3825734a46829a40bf348548d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_903caf40da2c4745b178f218f357d188.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/magisterium_4_ita.pdf
    • https://cdn.shopify.com/s/files/1/0472/3130/3845/files/55093294946.pdf
    • https://cdn.shopify.com/s/files/1/0437/2824/0794/files/android_recyclerview_adapter_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/minecraft_songs_i_am_believing.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/boverkets_byggregler_bbr.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/sales_forecasting_and_budgeting.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/fajajimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/bond_market_in_india.pdf
    • https://cdn.shopify.com/s/files/1/0462/5622/6455/files/rabezapifabogul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/brahmastra_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/32149271831.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/39789141560.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_off000111fb.bin
a5fbd38e2000a2ba83743594d9745a7159a1be26bdce888fcd038a0614ea44c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 5000 bytes
font_01_sfnt_off00012313.bin
bbdb40d78cc2a885d0232666ea93d33ca29bc3e510039660a110d22862d49e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 12644 bytes

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