Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabce858525e7ec7…

MALICIOUS

PDF

47.5 KB Created: 2020-08-10 13:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b1f2005e28fd4dab308d70402a965c SHA-1: c8d7ef74861b46d7a5034a27990a5fbcf4fdbd6f SHA-256: fabce858525e7ec7e3c5991b281756905442b0300e951d2b09ba4b66dc3f9661
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm suggests an attempt to lure users to malicious sites or manipulate search engine results. No scripts were extracted from this sample.

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/pify?keyword=bioavailability+of+nutrients+for+animals+pdf
    • http://files.mysportsmemory.com/uploads/1/3/2/6/132681482/4041562.pdf
    • http://files.400rusticstation.com/uploads/1/3/1/3/131379085/mamamirubak.pdf
    • http://files.nhsnpa.org/uploads/1/3/0/7/130740368/bogudatanejevuxojel.pdf
    • http://files.saintnicholasmouserescue.com/uploads/1/3/0/7/130776487/47c87e9c57.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/wudibululibatitifez.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/create_android_app_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/88961003982.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/71107036400.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/52715167514.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/60091771566.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/rugufexokuzufuzataresu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/jonarazumax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6428/6618/files/22254777053.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7318/files/wukukufomid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/79201336563.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/zusipuxes.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_off00007882.bin
d942b61021c7e88602918ddefccc0f6bc41601c0439953ff283d3c6b230b7601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7882 5536 bytes
font_01_sfnt_off00008b3f.bin
df6ab67278f22b8029ff1cdb0f6eaf22cb7b0b2d17af87fcb2c9e333530eee9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3F 10900 bytes

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