Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78a9ab4728688fc…

MALICIOUS

PDF

50.4 KB Created: 2020-08-03 13:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e3af420e3685c5068d1809b227450c SHA-1: 8db1879db5ae5e268bc2d2606313bd92f7f2b26d SHA-256: c78a9ab4728688fca29e02e71477b451653bb710ba132bf578a5595e24b8a487
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded URLs suggest a lure related to 'Adobe after effects cs5 tutorials for beginners pdf', which is likely a deceptive title to attract clicks. The presence of numerous external PDF links, many hosted on Shopify, points towards a link farm or SEO manipulation tactic, potentially leading to further malicious content or phishing pages.

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=adobe+after+effects+cs5+tutorials+for+beginners+pdf
    • http://files.customweddingringsmelbourne.com/uploads/1/3/1/1/131164063/mefumedasel-bizirizovez.pdf
    • http://files.notsuchsecretlife.com/uploads/1/3/0/8/130813458/4828466.pdf
    • http://files.hungtaolin.com/uploads/1/3/2/6/132681336/muxezuvebewix_luraludetivo_jaxume.pdf
    • http://files.thomascreekbaptist.com/uploads/1/3/1/6/131636692/noxaruzafo_wupopatizin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/72095822626.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/47689012738.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/kuloguvumoposujes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/35602921461.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/febofiwisumogexuraxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7847/5162/files/55425933668.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/biwalotudozufukagubazow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5538/files/80913851160.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/71585935073.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/73443077921.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/78127556603.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/dexinibivesike.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dd4.bin
df7d9149bf868ef52066de5969ec8011a9ad7138b21d4643ad413b2e874b8d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD4 5576 bytes
font_01_sfnt_off000090df.bin
e0ca7a5dfce7783051b892de9ccbfa7ff398c11f2cc7c0f9ba2f5930d4604713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DF 13924 bytes

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