Malicious PDF — malware analysis report

Static analysis result for SHA-256 81efe855a1e3f54a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-18 21:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06006c478c2803c8818bd5d4e4bad399 SHA-1: 74beed8db841ffaf612e75e2342d17497ec72808 SHA-256: 81efe855a1e3f54affbebdace2bf3ff3496cdce51986eef19f173673d2f0cbf8
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL 'https://ttraff.com/pify?keyword=ppt+keren+animasi+kartun', suggesting a lure to a phishing or malware distribution site. The presence of numerous links to external PDFs, many hosted on seemingly unrelated domains, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the ultimate destination.

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=ppt+keren+animasi+kartun
    • http://files.foxylockshairextensionsaustralia.com/uploads/1/3/2/7/132740805/wosafubow.pdf
    • http://files.seamnc.org/uploads/1/3/1/4/131437750/9261322.pdf
    • http://files.straymongrel.com/uploads/1/3/1/8/131871894/4cc60b638a0f8e.pdf
    • http://funejare.hipandkneeorthopaedics.com/uploads/1/3/1/8/131856602/52ab7.pdf
    • http://files.heritage-therapy.com/uploads/1/3/1/3/131381799/gipewivasufobox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/aleister_crowley_magick.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/gedosabevipanavukagenoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/sotimuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/download_aadhaar_card_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/rejedidesifaxuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/jurnal_keperawatan_anak_dengan_bronchopneumonia.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/navenomepepo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/22308755046.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/kifopokosigagirefalako.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0673/files/kupali.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/4081513971.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/bosch_automotive_handbook_7th_edition_free_download.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/1/0433/9168/0673/files/kupali.p

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b98.bin
42438b273b65a49f6dc4607fa3ac1bdb6ef763228c5ff123d0f56e8dc100f4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 4772 bytes
font_01_sfnt_off00007ba1.bin
e503a9bbaa26e56de4cb4db6c3a076db17bb9cf88965a5d3966cd3476ab1e857
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA1 9860 bytes
font_02_sfnt_off00009d20.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D20 4324 bytes