Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ceb41e465a5377…

MALICIOUS

PDF

71.3 KB Created: 2020-08-23 05:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e072116280331ea7cf3d7662ebc5abe2 SHA-1: bae1eed1c3386bc3f64d2693bcf14825a23ddeef SHA-256: 71ceb41e465a5377d1f5a625eacac36693f0e14c473ea45b6f7a79d42ea5dd23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to drive traffic to malicious sites. 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.ru/pify?keyword=report+burst+water+pipe+sydney
    • http://files.macysullivan.com/uploads/1/3/0/7/130775747/warojiv.pdf
    • http://files.art-camp.org/uploads/1/3/1/4/131406448/rurokidoderakaw-zezujaziba.pdf
    • http://pedovubik.marzbanhealthandrehab.com/uploads/1/3/1/4/131438641/ledofitax.pdf
    • http://files.shopthcattire.com/uploads/1/3/1/4/131453431/2173997.pdf
    • http://files.nancyfreemanstudio.com/uploads/1/3/1/6/131607027/witololafamilaw-vuvawat-zakilaj-zivepunilolokip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/babavajigubedonineze.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/bus_game_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/canon_lide_300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/nijuduzagaxaretid.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/robunemur.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/77807376098.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/97737415541.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/pimitagubamuxomexela.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/32975713580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/36495431026.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2475/files/nawawuxutagubip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/2744497945.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000ed0f.bin
459250c5969386ca625247877f24f801658094977e4eb1be14cbcc8175d1dfd8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED0F 20404 bytes
font_00_sfnt_off00006f0c.bin
c3ae0251886414980164aa098f2c76a4eb8015d0452177b18ba449d9c995f91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 18396 bytes
font_01_sfnt_off0000a930.bin
8b7d2d4acf807b607ad62c6522e99fa6e8666c9f539b4cff16d7381c43bc7375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA930 5264 bytes
font_02_sfnt_off0000bb37.bin
4fa2e4874fdbde9c5b6de64a2ea336c26c4476f791ec07660c8d0fec5aea03d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 16796 bytes

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