Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cec17680c8d7f8…

MALICIOUS

PDF

36.4 KB Created: 2020-08-18 12:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b9338e47e9cd5efd7272471e0539c0 SHA-1: c87bb4207455725bd5512afc3e7d591894cb5af9 SHA-256: 71cec17680c8d7f809dc120603ae92cda27d263be71f16e380167cb21e366dc5
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with the primary link pointing to a redirector service (ttraff.cc) that likely obscures the final malicious destination. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or redirection strategy to distribute malware or phishing content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=kundali+bhagya+sajda+song++pagalworld
    • http://files.randyky.com/uploads/1/3/1/3/131379296/1351797.pdf
    • http://files.mayswebsite.com/uploads/1/3/0/7/130776266/5426754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/42233654024.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4865/files/trauma_nurse_core_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/59310052079.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/rebufaxitilisavix.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/korean_basic_language_in_nepali.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/vijexepamomapuwubuw.pdf
    • https://cdn.shopify.com/s/files/1/0450/5151/0936/files/shazam_trailer_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/resofilomuxarerul.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/makalirefaxedijubixowim.pdf
    • https://cdn.shopify.com/s/files/1/0435/9795/5229/files/27726835996.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/nufez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/wakukaronezufavun.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_off00004300.bin
5bdb6b39faa55e0791b6e701e6979aaa406c1620e490c4947fb19a1c02d7a7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4300 5600 bytes
font_01_sfnt_off00005619.bin
e7208b62c436d78e7b47a821f49266f10071235a5f367218c1ff28f4b26bd0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5619 9592 bytes
font_02_sfnt_off00007725.bin
6680d00f9f5c3ab0f87b0d74f804a77b9ee05f1819fcd062860ef5fb7f6289b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 3416 bytes

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