Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc2c56a31387e43…

MALICIOUS

PDF

50.5 KB Created: 2020-08-15 03:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9b2ce2442a8aa35afdc7c93bd27847 SHA-1: d11802b1feb0753bcab047a3eb9d1d4e6c254003 SHA-256: afc2c56a31387e437eca42dfea311eef3324f1195ca1547c6253ccd574da4a7a
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=exam+results+sheet+explained', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to exam results and the malicious URL, suggesting a lure to trick users into clicking the link. 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.com/pify?keyword=exam+results+sheet+explained
    • http://files.crowandlilac.com/uploads/1/3/1/8/131871902/6581105.pdf
    • http://files.mikesmobilesolutions.com/uploads/1/3/2/6/132681336/bifopivofaja-kujibi-sosateronaxekig-biratitelega.pdf
    • http://files.tangiblegreen.net/uploads/1/3/1/3/131384495/281d523a0a4f.pdf
    • http://mawaloxuk.nicholasruscettaart.com/uploads/1/3/0/7/130775997/gikafibakag_motubimuf_pijagovulerod_sunipumapa.pdf
    • http://files.hvacrepairtemecula.com/uploads/1/3/1/4/131483386/vosizugekit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/tiwexalaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/google_sheets_histogram_labels.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/punozivebojarigagetowebow.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/38016125189.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/kibenawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/22097617456.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/guia_de_ejercicios_de_calistenia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/90634038206.pdf
    • https://cdn.shopify.com/s/files/1/0432/1948/4839/files/kulelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/diabetes_gestacional_definicion.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a5.bin
23e8cfde14408656995582c21943eeec0eccc9e5a2f65670b9631e3a4117aa8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 6452 bytes
font_01_sfnt_off000079a7.bin
98a8c693c81bb307b60e6237bcfc86ffd53963cc2dd2abb40890d553c16b2e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A7 4996 bytes
font_02_sfnt_off00008a76.bin
035ec2c907c497577134143f921ea9549f9db461fd2ba9a26dc46e93e61ef6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A76 10492 bytes
font_03_sfnt_off0000ae44.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE44 4324 bytes

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