Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a7a77dc16395f9…

MALICIOUS

PDF

51.5 KB Created: 2020-07-29 01:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5dd2e2e1819c4060b57d9ca3a9adf7 SHA-1: b541880a14ce70dec1a84da3a2c47398966fef12 SHA-256: 56a7a77dc16395f95dd73fd31e6b36f3142add0007e62883490236e86bce47b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=in+dulci+jubilo+buxtehude+pdf'. Additionally, it exhibits a PDF SEO link farm pattern, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0428/7217/6799/files/74694882915.pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and link farm structure indicate a phishing or redirection attempt.

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=in+dulci+jubilo+buxtehude+pdf
    • http://files.foodsecuritytech.com/uploads/1/3/1/3/131379113/a177ffeb.pdf
    • http://files.centerstagedanceonline.com/uploads/1/3/1/8/131857315/2417179.pdf
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdf
    • http://files.westwindsfarmcolorado.com/uploads/1/3/0/8/130813399/sepaviwujokefef.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6799/files/74694882915.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/kojuvatafawavov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7581/4047/files/lopurokibeteku.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/44673265068.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/fukikosigewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/26490672881.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/96517221659.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/fazasodivozufef.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2412/files/lixegetofifep.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/73846265931.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/89931247705.pdf
    • https://cdn.shopify.com/s/files/1/0428/4458/6140/files/60963261191.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/
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/44673265068.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bb3.bin
98681a6933498805052335d65c19e982d982e88a14d8170edec9b4a5540ba1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 4864 bytes
font_01_sfnt_off00009c38.bin
509a93f470a307a0ed3346d98e6b1793f6c11d40c93b718db38665c7b90b3a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C38 11312 bytes

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