Malicious PDF — malware analysis report

Static analysis result for SHA-256 77737ee327ecf32d…

MALICIOUS

PDF

42.1 KB Created: 2020-09-01 01:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae57639020e1f6cf0dbe3a848d0d1e7 SHA-1: 36500d45a0a26ed0b60ffbcca7777f6578b08783 SHA-256: 77737ee327ecf32d3d01ec932582cfd14a8357350de256ca6650ef63495b0d0e
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains a deceptive title and a call-to-action phrase, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=longman+dictionary+for+windows+10+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/free_bowling_flyer_templates_for_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/satamerobezopugoveduk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/mathworksheetsland_answers_scientific_notation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/surah_an_naba_lengkap.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/57393560526.pdf
    • https://cdn.shopify.com/s/files/1/0433/5452/1758/files/89997925769.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/8012089445.pdf
    • https://static.usrfiles.com/ugd/909b15_b5edb053d1cc4839b48ed54ab49a7af6.pdf
    • https://static.usrfiles.com/ugd/de3d83_553c9ab81dfc4400a550520408a646c5.pdf
    • https://static.usrfiles.com/ugd/01bc73_2c5ebc01902a48abb5dde701fce34fdc.pdf
    • https://static.usrfiles.com/ugd/8cbfce_f7bb3dd825a5462581f2f56f9ef792ea.pdf
    • https://static.usrfiles.com/ugd/e5a943_2335d502dfcf4768a310023b27ac391c.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_off000064bb.bin
58ea4258188f0e33e031bd219b2c16b1bc8f854298e993aecc4186ab3ded78ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5640 bytes
font_01_sfnt_off000077f7.bin
306c1fcbc8c73c02264ea7e28d84dfc516de81f1a75f657843608c90d0fd4323
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 10336 bytes