Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efabf9efcbd1423…

MALICIOUS

PDF

58.4 KB Created: 2020-09-13 10:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02fc4e0101da25473291eea2f4cfa0fd SHA-1: b5baf6b6642c7199a7f9bfa4d676f86ea31764e1 SHA-256: 1efabf9efcbd142312b7f2d723ed5e608a2a27160f9a5db35bbec0121e69a319
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'minecraft unblocked chromebook'. This URL, https://ttraff.ru/pify?keyword=minecraft+unblocked+chromebook, redirects to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=minecraft+unblocked+chromebook
    • http://files.oakdalefarmscountrybarn.com/uploads/1/3/1/4/131408131/lepopilele.pdf
    • http://files.masofrancesco.com/uploads/1/3/0/7/130738812/xeruzasi-sivub-xejone.pdf
    • http://zezesom.houseoflightuk.com/uploads/1/3/2/6/132680813/mikojulawitif.pdf
    • http://rusav.halovolleyball.com/uploads/1/3/1/3/131380942/4d7e66.pdf
    • http://fipomew.wilkins3.com/uploads/1/3/1/3/131380158/rajikubixa-zefulupodomujax-noputivu-giwaji.pdf
    • http://xudimum.bethanyslater.com/uploads/1/3/0/8/130813533/tofamilogatapebe.pdf
    • http://jaxutaki.duachmusic.com/uploads/1/3/1/6/131637814/3291670.pdf
    • https://cdn.shopify.com/s/files/1/0481/4353/2185/files/opengl_es_2.0_programming_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6284/files/75978151139.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/electrochemistry_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/57959221703.pdf
    • https://cdn.shopify.com/s/files/1/0465/4016/1183/files/7756939282.pdf
    • https://static.usrfiles.com/ugd/7c1f05_e2b8ca1e5ae74697aa9c678497362020.pdf
    • https://static.usrfiles.com/ugd/f3cb45_6d074dcf240445759ef658f57317a105.pdf
    • https://static.usrfiles.com/ugd/95b9ea_ecf51bf071fb4fd8ab36750f95fe3184.pdf
    • https://static.usrfiles.com/ugd/87fdc7_77b1d62b2de84b7ca902d0824ee915da.pdf
    • https://static.usrfiles.com/ugd/c7a620_657f892e31ef446f8ad4d0af0b0aa090.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aef7.bin
981309227ba39d8ec5cf8fea154c793eef2c3680fb9fffbaa11019f10ed91fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 5292 bytes
font_01_sfnt_off0000c0d9.bin
ecfe8b1c746fd279cf4ab9da4de637adebef1305fc1ed17f989e1b9b8a40ecbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D9 10668 bytes

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