Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb268729a6cbb4b8…

MALICIOUS

PDF

45.7 KB Created: 2020-08-23 19:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 250046387d1be9cc608558fb5c165796 SHA-1: b88b0fb8726bddab62656eefe3898b54234c1d9f SHA-256: bb268729a6cbb4b8cdb8a377a16f98ce24ee257377d8f96a07c73ccc3fbcaf89
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text that appears to be metadata and embedded URLs, including the malicious redirector and a link to a Shopify-hosted PDF. This suggests the primary purpose is to lure users into clicking malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=aweli+ya+weli+mp4
    • http://files.incubator143.org/uploads/1/3/1/3/131383934/8155135.pdf
    • http://files.newenglandbusinesscenter.com/uploads/1/3/0/8/130873791/2961053.pdf
    • http://files.geektravelgroup.com/uploads/1/3/1/6/131606502/lebege_naminisolugofo_sezajaxojakejol.pdf
    • http://files.memortazavi.com/uploads/1/3/1/0/131070389/a5b2ace.pdf
    • http://files.grandeprairierugby.com/uploads/1/3/1/4/131406412/vufiluxakezej.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/pdf_converter_to_word_file_free_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/jisexuromepotavixujelax.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/kakerevimulifor.pdf
    • https://cdn.shopify.com/s/files/1/0440/6634/1029/files/boximomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/phn_mm_chuyn_file_nh_sang_cho_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/bootstrap_website_templates_github.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/volexepefisep.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/81431366568.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/bixojufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/pijogekizupakajowinuxizi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008079.bin
2e2ad49072fe29fb92450224e83a315cf2a371da26517a4e4da053759a44708d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8079 22744 bytes
font_00_sfnt_off00004cf9.bin
6ff8e1ddbb3cb322c56c69ca338cf0146ceb453e890b9dc7a231851f51b29a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 4960 bytes
font_01_sfnt_off00005de6.bin
2299d41a41c5cbd92b3a7089e84ae104a2cd418cdba0f3cfca7034b65465bff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE6 10556 bytes

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