Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b35516bf80e86bb…

MALICIOUS

PDF

41.9 KB Created: 2020-09-04 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae36d2d2cba770b5405cf27d5fceb3f2 SHA-1: fbe01bbc222ba3d4e5c7e026fb0d0ec3dd61e000 SHA-256: 6b35516bf80e86bbaa5c549054d57856da8810044f2e3a1397775132d7d036ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links to external PDFs, including one to a malicious redirector, suggests an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=preeklampsi+nedir+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9884/0995/files/band_baaja_baaraat_movie_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0450/0822/4414/files/getting_around_boston.pdf
    • https://cdn.shopify.com/s/files/1/0440/7292/7384/files/ableton_9._5_crack_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/37695975886.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/runescape_sentinel_fragments.pdf
    • https://static.usrfiles.com/ugd/238140_5b7e76dd8321473eb08f14767716b028.pdf
    • https://static.usrfiles.com/ugd/02af14_9ac3a7b26ace484d88049bba5bf510bd.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_4a90a900927f43b5b141459da1af8669.pdf
    • https://static.usrfiles.com/ugd/fb5067_8ef12155ff4c4c6a9bfe9953b6c1695b.pdf
    • https://static.usrfiles.com/ugd/77eba6_c0a16299e5d4470dbb630f1e98326b95.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/turig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5832/files/15303705382.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/901194131.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/suddenlink_channel_guide_lubbock_texas.pdf
    • https://cdn.shopify.com/s/files/1/0465/3052/7382/files/advertisement_psd_template_free.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_off000063ea.bin
415c614bf349813182b47dd8976a36452db43fed27169ae1454a24196f71b22e
pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 5252 bytes
font_01_sfnt_off000075b2.bin
114af0d623c9c68f4e46e55a942128e54a5006c3dd08024288020ea2926486a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B2 11328 bytes