Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c8bc5d33cfb806…

MALICIOUS

PDF

46.6 KB Created: 2020-08-04 22:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350b0c3ef3511b475cc93cb5a309601b SHA-1: 304eda317a136590cc4334846893623e05c43e9b SHA-256: 02c8bc5d33cfb8067377b80aa31f5a1d64fda7c0a5fb1827cbfe5bd91208e734
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Astm a36 a36m pdf free download' and the malicious URL, suggesting a lure to download potentially harmful content. The presence of embedded URLs and the ML classifier's high confidence further support the malicious verdict.

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.com/pify?keyword=astm+a36+a36m+pdf+free+download
    • http://files.mustafaclub.com/uploads/1/3/1/3/131379544/tuxoleligorewew_turefej.pdf
    • http://files.interfaithutica.org/uploads/1/3/2/3/132303286/zikibazetajeku-zixewijerobu.pdf
    • http://files.maggiekay.org/uploads/1/3/1/4/131453944/suxasumugosowu_zateloloxip.pdf
    • http://rogemukuz.denaliandcompany.com/uploads/1/3/0/7/130738943/fujejukorebifow.pdf
    • http://files.lakecitychamber.com/uploads/1/3/2/6/132681690/gujegedib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/37459124991.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/xotava.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/62738414179.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/american_standard_freedom_80_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/46424550507.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/menuzatewobelomop.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/dark_mode_mac_os_high_sierra.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/47221060586.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/steam_how_to_refund_a_gift.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/macroeconomics_hubbard_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/rojesarezarewatisuvimu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/suxesovusigezolegazasu.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_off00007639.bin
6b9c2bbbe1acc8157e32cfa25b3992846cdc73bb75f0c9c12f9ded19ef9cfa1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 5584 bytes
font_01_sfnt_off0000892a.bin
78250f943eaa06a528dbc141c7fb89170dbf9118ab2de604e24de11c186701b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892A 10656 bytes

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