Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ca10347b248b5d…

MALICIOUS

PDF

52.4 KB Created: 2020-08-20 03:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07526fd0c7c1cb1e84b2d86d8bfa8322 SHA-1: db8f2c7f63632faa38d29d47917e34fb4be0c09f SHA-256: c4ca10347b248b5d0eaa166f75f014db46ada83f7ee5a0f1f53365f8a298c7fb
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an admission form, which is a common lure for phishing attacks. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the link leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, suggesting an attempt to obscure the malicious destination. The document body itself contains the lure text and the malicious URL.

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.
  • 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
  • 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=du+admission+form+2018+ug+fees
    • http://files.exleyfarms.com/uploads/1/3/1/4/131438557/gikovitijot.pdf
    • http://files.markbury.com/uploads/1/3/0/7/130740524/benimogerapaku.pdf
    • http://files.tobyupci.com/uploads/1/3/0/8/130814784/68b7a0eb.pdf
    • http://ruzolujup.getmovingpt.com/uploads/1/3/0/7/130775734/nalawiti.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/30674654276.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/98861822516.pdf
    • https://cdn.shopify.com/s/files/1/0438/0655/6320/files/wavelet_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/gugutajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/97654809276.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/69068380839.pdf
    • https://cdn.shopify.com/s/files/1/0430/4407/7722/files/zugawezovape.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/dobawixaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/clinical_chemistry_bishop_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/7294047252.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/jenuvozasumubugefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/musigusuwekun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/dovepaxobomevume.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/fuwagetufeziripevot.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d86.bin
16962e9d767aeff89ac52aee74bbc882891e66fa02a26b1f916056df4cd528d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D86 5712 bytes
font_01_sfnt_off0000a0df.bin
b504bf4cba7cfbd76a573516767f4423191b679a175cf9ed60689666f4bbadc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DF 10428 bytes

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