Malicious PDF — malware analysis report

Static analysis result for SHA-256 0755d77a0cfd90d8…

MALICIOUS

PDF

44.2 KB Created: 2020-07-09 04:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84845c4b2efe80f8e8a3883dd3190045 SHA-1: 7d1f6069f5ae5770bf99eee473a8d736f4720d36 SHA-256: 0755d77a0cfd90d85cab5833b43fd6c51703fbd6fa080e572479023ae11a33ae
154 Risk Score

Malware Insights

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

This PDF document contains a link farm with 30 external PDF links, many of which point to potentially malicious redirector infrastructure. The primary embedded URL, https://ttraff.ru/wb?keyword=free%20printable%20fun%20math%20worksheets%20for%203rd%20grade, is flagged as a known malicious redirector. The document's content and structure strongly suggest a phishing or scam attempt designed to lead users to malicious sites.

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.ru/wb?keyword=free%20printable%20fun%20math%20worksheets%20for%203rd%20grade
    • http://files.lbcatwateroh.com/uploads/1/3/0/7/130740124/585a93ae527f.pdf
    • http://files.copelincontract.com/uploads/1/3/1/8/131857193/6879c55ac.pdf
    • http://files.battleagainsthunger.org/uploads/1/3/0/7/130739498/gupakujinexaselorite.pdf
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdf
    • http://files.cnhcep.com/uploads/1/3/1/3/131380467/c2ff52.pdf
    • http://files.viceroyautotrans.com/uploads/1/3/1/3/131383802/8683192.pdf
    • http://files.superdiscountwigs.com/uploads/1/3/1/3/131384121/terobasugivitu.pdf
    • http://files.skyezentzmusic.com/uploads/1/3/1/4/131409508/4804667.pdf
    • http://files.brittalinnanderson.com/uploads/1/3/0/8/130814674/27ec0e8c4.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fakemoj.files.wordpress.com/2020/06/41530402424.pdf
    • https://fofudulopave.files.wordpress.com/2020/07/69980788407.pdf
    • https://nebeseti.files.wordpress.com/2020/06/pivur.pdf
    • https://fazefamakof.files.wordpress.com/2020/06/60872295912.pdf
    • https://namerixug.files.wordpress.com/2020/06/jodutitodo.pdf
    • https://gufakiv.files.wordpress.com/2020/06/68428640189.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/koxumugude.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_off00006d62.bin
a013ce32f25a0cb7b0a79bc2d4621031af2de8f852d15c8da1e1518d860524e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D62 5752 bytes
font_01_sfnt_off000080d5.bin
16a087e23b7941a876f6c52169c62f87acfabec863e6fb8690242e0eaeff6b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 9952 bytes

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