Malicious PDF — malware analysis report

Static analysis result for SHA-256 78be40403fe7c6a6…

MALICIOUS

PDF

53.0 KB Created: 2020-08-25 15:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 606957aaa895e0798f199965bf2a03e1 SHA-1: 5fb65fb4e66c54f4b14f958f03435a917a4f3925 SHA-256: 78be40403fe7c6a6c9f8814a83d071f8e55437c4ded474c38867a0151526a429
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical finding is a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence suggest a malicious intent to redirect users. The document body itself is heavily obfuscated and contains embedded URLs.

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=congenital+deformity+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD
    • http://files.47fullerroad.com/uploads/1/3/1/0/131070062/fipomobiduxepelax.pdf
    • http://files.littlelanedaycare.com/uploads/1/3/1/1/131163832/493426.pdf
    • http://zevisus.sharonlewis.net/uploads/1/3/0/8/130814229/4614231.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/aadat_song_by_ninja_djjohal.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/tang_soo_do_forms.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/47270664038.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/87657157613.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/29159343377.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/58883392237.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/5261093395.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/jawisubotexetoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/pujefanazegener.pdf
    • https://cdn.shopify.com/s/files/1/0435/3520/4511/files/adobe_acrobat_editor_free_download_full_version_crack.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f55.bin
812fb89007deeee788da68ea3637cb6875c4261b4d31b7504dcb791f14037b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F55 5056 bytes
font_01_sfnt_off00007070.bin
06cd6ed2965f77b340b53ac89f370f2e1095cb0a72863b90eabc85e3e44b2983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7070 6180 bytes
font_02_sfnt_off0000806b.bin
f2a9347c55e273c4a5168c1c08bbba38a029a47cfad01013ad39d7e9766897ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 7412 bytes
font_03_sfnt_off000094a2.bin
bbed89b33d95ea3a7fc18c924c06b98057b4185358519f3815e412e3e5bc7cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A2 15188 bytes

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