Malicious PDF — malware analysis report

Static analysis result for SHA-256 153514cac988d6a2…

MALICIOUS

PDF

47.0 KB Created: 2020-08-22 15:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5e17ed9255890f2eee5559b4d149e6 SHA-1: 3daafe4686bc188924bc191fff0c1d4a6fe4703f SHA-256: 153514cac988d6a2bdf23c87e1fe43fb62cee36d264b51235c92e1ff5899d576
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for 'ap chemistry lecture notes pdf', and also contains the malicious redirector URL and several benign-looking Shopify URLs. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=ap+chemistry+lecture+notes+pdf
    • http://files.fireartsarcata.com/uploads/1/3/2/6/132695472/a06df4.pdf
    • http://files.emmamaitland.com/uploads/1/3/0/7/130775865/lotalalatofozu.pdf
    • http://zebute.birchbots.com/uploads/1/3/1/0/131070487/mewowapaxovag-kexuxusomamu-vezeb-kiguwex.pdf
    • http://files.frankicolett.com/uploads/1/3/1/3/131379830/ladipekige-wubekiwopiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/angular_json_schema_form_condition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/54291431770.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/40098047923.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/data_science_do_zero_joel_grus_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0524/6631/files/39320215518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1469/files/dizinokerumozekagudorun.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/wavokupetemuvode.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/23380355254.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/45546184867.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/defendu_fairbairn.pdf
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/ti_89_titanium_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/rufitujoretil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/47919713117.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_off0000794f.bin
c3399ac0be292862d58c9e81526d82ac557199f13862851b1119660f521e4e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794F 5276 bytes
font_01_sfnt_off00008b25.bin
8e98d22bf5c2ad3b74d0f2c04e3061f428168bf49754939f5bae06bf5e442fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B25 10628 bytes

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