Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c909c5988996dd…

MALICIOUS

PDF

66.3 KB Created: 2020-07-20 01:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1367c8f1ffc641e18b9295af003480 SHA-1: f23be4eba83ae29b9f1fb120137b2d283dd76cce SHA-256: 57c909c5988996dd030e70ef53a5c9771fd31d76a0c9f3b4e938c7342a4a54a9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=android+clear+button+in+edittext
    • http://files.loranchollete.com/uploads/1/3/0/8/130813307/1ed7afb5422deb.pdf
    • http://files.cloth4everybum.org/uploads/1/3/0/9/130968960/bisagalavuv.pdf
    • http://files.cannonfallsdanceteam.com/uploads/1/3/0/7/130775221/misok-wofuporotawaxaf-duxezevin-kumezikew.pdf
    • http://files.eratoalakiozidou.com/uploads/1/3/1/0/131071277/5dc7eb897eab6f.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/lakapalatuxawivurosino.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/59166666198.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/5498017553.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/puwevidozurip.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/vovidanepiru.pdf
    • https://lopojezo.files.wordpress.com/2020/06/kotebotofolun.pdf
    • https://negenuwi.files.wordpress.com/2020/07/38853361093.pdf
    • https://surefab.files.wordpress.com/2020/06/tupedigetezifofufuxaz.pdf
    • https://zipojuroxob.files.wordpress.com/2020/06/diromugo.pdf
    • https://gezanafekebu.files.wordpress.com/2020/07/69047852786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/33089922655.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/87265216215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/62045464140.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/duzowopiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/muzifebovuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/77505761465.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/1902863370.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_off0000c02f.bin
dd40dea4df6f8c6f24ec2b9108142a12c7229ac662cd127e2ca26a6a1f7e5c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 4836 bytes
font_01_sfnt_off0000d09d.bin
2210cb351d00c4c5760a8f6e32bb8cfae86f5f8fb7ad64cf4fe946a01b278641
pdf-font-stream PDF embedded font (sfnt) at offset 0xD09D 13620 bytes