Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e736a748fb06c82…

MALICIOUS

PDF

36.6 KB Created: 2020-08-16 18:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc2f9b550aafe88322d3d7f0434d291 SHA-1: cfd9b144ca585dc351d77e87d6a55b39431dcdc7 SHA-256: 6e736a748fb06c82014c7d6d6524d9ae4c9cf068b656bedd60765c3e362399a1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to a redirector service known for malicious activity. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm, indicating a potential SEO poisoning or link-farming attack. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=calibre+font+free++mac
    • http://files.mycorporatecounselor.com/uploads/1/3/1/4/131437983/1606706.pdf
    • http://files.liviajatoba.com/uploads/1/3/0/7/130739369/mitetavuluru.pdf
    • http://files.dianajart.com/uploads/1/3/0/7/130738755/aa5843a.pdf
    • http://kenola.lahereclecticbeautysupply.com/uploads/1/3/0/9/130969723/2133688.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/jurnal_akuntansi_biaya_konvensional.pdf
    • https://cdn.shopify.com/s/files/1/0429/0586/2307/files/75556372182.pdf
    • https://cdn.shopify.com/s/files/1/0430/9126/3649/files/jilibadevukamir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/mojizanabexedosunukukoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/rinumip.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6357/files/92757874981.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/42749990915.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/53040078095.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/nordvpn_is_horrible.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005156.bin
2866cf6fca98ca705c2b76bcc76c58669766c4eb0f71bcca58284381c3f8b3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5156 4896 bytes
font_01_sfnt_off000061e3.bin
2020ea6e15a6cfaddc8d16e5f4dfe71254b8fc1d904e63938a327dae421bb4d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 10528 bytes

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