Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b53648a84055deb…

MALICIOUS

PDF

46.3 KB Created: 2020-08-16 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ab8152a520defe039a9f1ef0a33557 SHA-1: 7ecef2fcfb6f36abfd5c5aada826c7dd344575ec SHA-256: 6b53648a84055debe5515f6f68e409a74d4d8bbe833b40aad9aceae0037f7058
202 Risk Score

Malware Insights

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

The PDF contains a lure related to an exam date sheet and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bteup+date+sheet+2019+even+semester+exam
    • http://telareje.kelseyelizabethphoto.com/uploads/1/3/1/1/131164250/noxinon.pdf
    • http://files.dancetothink.com/uploads/1/3/0/7/130775653/dofasazozok-rujexatuxeduz-gonunimezowevi.pdf
    • http://nikawuso.myanimaltags.com/uploads/1/3/0/7/130775422/likifuzag.pdf
    • http://genoven.triplem.ca/uploads/1/3/0/7/130738902/7163684.pdf
    • http://goteti.fergusmassagetherapy.com/uploads/1/3/1/8/131857445/zonufixuxupoxuw-fexez-podasebazemamem-pegulaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/diy_laptop_stand.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/26935486634.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/midusovivaredikesimozuzem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8149/7766/files/vidupimefud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/rasoviratisenozitol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigemeziguvego.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/curl_post_example_json.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/84366324276.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/dizugetatumarunoxaxere.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/deontology_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/82855580149.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/piwenaretul.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/
    • https://cdn.shopify.com/s/files/1
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dc6.bin
b53a2c6811c7a7724152783ac6b1529126902adfd8547614bf70daf91f961b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC6 5824 bytes
font_01_sfnt_off00008174.bin
0eedd2e05bf92c39e42d9bfe7df484e3c49075b2464c1a80f8db26cd2c76bcc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8174 13480 bytes

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