Malicious PDF — malware analysis report

Static analysis result for SHA-256 777e61f601721536…

MALICIOUS

PDF

44.0 KB Created: 2020-08-15 00:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ffe656d54de914e5ca3be34b20394a SHA-1: c83556744185454a0f2f549b474d798527a04c91 SHA-256: 777e61f601721536f7d6ff10bec586aca0524c82acd4f4d5566350fbf1ee31a8
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational worksheets. This URL redirects to `https://ttraff.com/pify?keyword=rational+numbers+class+7+cbse+worksheets`, which is a known malicious redirector. The document also contains links to numerous PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=rational+numbers+class+7+cbse+worksheets
    • http://files.salsaon2school.com/uploads/1/3/0/7/130738805/26e7f0bf26e58.pdf
    • http://files.xinzhangdesign.com/uploads/1/3/1/4/131437676/valazamojox.pdf
    • http://files.patriciasplacecatholicgiftshop.com/uploads/1/3/2/6/132695321/lanunefebazol.pdf
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • http://files.parosclassicalpianofestival.org/uploads/1/3/2/6/132695633/jeguvujutiruwozumadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/dalotido.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/43286259270.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/diablo_3_strategy_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/guniwilur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/coordinate_graphing_worksheets_halloween.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5460/files/27128203614.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/puwuzapewuketonepixuzojat.pdf
    • https://cdn.shopify.com/s/files/1/0437/8791/1319/files/business_action_plan_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/5184804188.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/zeworijejawegojimadebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/32798214951.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_off00006d1a.bin
51a2b896fda807a11b3235f59585accfee410ae9d61bca19f56450ba232c5d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1A 5420 bytes
font_01_sfnt_off00007f7a.bin
07f1984fa73faa3dc7a7d8a31626ba65b89f78556e1e03b93962d3d0ee398089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 10192 bytes

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