Malicious PDF — malware analysis report

Static analysis result for SHA-256 599d67a1b67da078…

MALICIOUS

PDF

38.6 KB Created: 2020-08-23 11:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdcc6ff9dbf6c15652e606d1336f67ca SHA-1: 02a50315f6a1107f2be0e6d8268eb1aa40cb2b49 SHA-256: 599d67a1b67da07813a910baf376a234f47f2f44ceaa696bf4186a36f6279bb4
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=subjunctive+vs+indicative+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be disguised as an educational worksheet to entice clicks.

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.com/pify?keyword=subjunctive+vs+indicative+worksheet
    • http://files.kocanada-usa.com/uploads/1/3/1/3/131380596/e1d41f43b7b2b.pdf
    • http://wepusegi.sp-arms.com/uploads/1/3/1/4/131453718/jefojowatinizi_vojifizas_zizawofelilebad.pdf
    • http://files.salve-eebee.com/uploads/1/3/0/8/130814085/susodolus-norukugukobe-xalulab-weruwimux.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/interactive_electrocardiography.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/jowotezelorunemel.pdf
    • https://cdn.shopify.com/s/files/1/0464/5093/3928/files/movie_tv_guide_brisbane.pdf
    • https://cdn.shopify.com/s/files/1/0440/8583/7989/files/badshah_movie_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/main_vichara_song_djpunjab.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/81005435299.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3418/files/purebobitoduzago.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/lowodumezapemuwita.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/anlage_av_er_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/pabasasuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/57298372896.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.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/1/0431/0433/8074/files/anlage_av_er_2020

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f4.bin
807382adb19eb543202ddf51d10479f78a1f528333c5dae44b37804c9bc30f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x57F4 5528 bytes
font_01_sfnt_off00006acb.bin
95805a107155090ba552cf02dc5274be00c85e8b5494fcc3c667271534ee6753
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACB 10176 bytes