Malicious PDF — malware analysis report

Static analysis result for SHA-256 1577273491be3f13…

MALICIOUS

PDF

44.1 KB Created: 2020-08-03 15:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d9f162625d6bdaad8d43540d9a781c8 SHA-1: 083a227d840b4be03970769ae013213e31454a3b SHA-256: 1577273491be3f136b9dcb918f89f0b3794f54f1c4e067f5d5023e2b390d5b13
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL "https://ttraff.com/pify?keyword=stockholm+airport+map+pdf", suggesting a lure to trick users into clicking on malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=stockholm+airport+map+pdf
    • http://files.devitawellnessnow.com/uploads/1/3/0/7/130740357/5241551.pdf
    • http://files.mapleviewhorsefarm.com/uploads/1/3/2/6/132681342/gibizijidesij_zejodin_voxoriwedetik_fumujumad.pdf
    • http://files.themakeandcreateshop.co.uk/uploads/1/3/0/7/130775261/dalaba-renir.pdf
    • http://files.orderaugies.com/uploads/1/3/1/4/131407855/d8e7e6ef12a46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/nobidoxiwaneze.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/f_string_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10699911966.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/82635832890.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7936/files/93876435410.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/panupidudufimevazarina.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/fufidobusoxawewagujow.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/fipuxiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/duzixidurobodarifukileguz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/223389067.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f9.bin
0975eb6a5950f0b11bd0b88880221058170fe49b145d8aa20fb460691f7a2917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 4948 bytes
font_01_sfnt_off000068ae.bin
78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 2092 bytes
font_02_sfnt_off00007253.bin
cc565ad86ea095d3d6eb6aaa299d93f0815079638e68f6d6408cb6dda4c0a60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7253 10176 bytes
font_03_sfnt_off0000952f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952F 4324 bytes

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