Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6465ca22034c0e5…

MALICIOUS

PDF

47.2 KB Created: 2020-08-24 21:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ecd9fbeb1e4ef12fbc7ab11aaf21fa SHA-1: e82b6e80d36078f2fb11584ec86bc7960c772306 SHA-256: d6465ca22034c0e56a07e760a82d0833601c04a6700746fb4b74c3340c79efe6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=appium+android+testing, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but contains the same URL as the malicious redirector.

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=appium+android+testing
    • http://givup.constructionprogress.org/uploads/1/3/1/4/131482995/vevigomawob.pdf
    • http://files.thedrewdrake.com/uploads/1/3/0/8/130814666/wuwemuzami.pdf
    • http://mizopagez.beardedbomb.com/uploads/1/3/1/0/131070894/tikavoliz.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/sabidogugovubabeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/bilibili_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/AMAZONHTTPS_WWW._GOOGLE._COM.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6908/files/62881320337.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/wibuvironelamumapid.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7327/files/lobiribazulamudeguz.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/microwave_blanching.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0793/files/gapagokebositob.pdf
    • https://cdn.shopify.com/s/files/1/0437/5343/9383/files/95304679419.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/gsm_and_cdma_technology.pdf
    • https://cdn.shopify.com/s/files/1/0459/9962/0263/files/carly_adapter_bmw_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/84878062051.pdf
    • https://cdn.shopify.com/s/files/1/0440/6745/5128/files/japanese_smiley_face.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1485/files/87958975461.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006804.bin
6bdab118f43b82ac6ec96830e4b9b255fb5cad0c598cc49f2a35ca2f6944df69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 5120 bytes
font_01_sfnt_off00007942.bin
331cd993f06a413a4fcef8734c5328760589c75ee73ddfe90dd7a06930157120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7942 12240 bytes
font_02_sfnt_off0000a1a4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A4 4324 bytes

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