Malicious PDF — malware analysis report

Static analysis result for SHA-256 676b7ca1383311ec…

MALICIOUS

PDF

40.1 KB Created: 2020-09-17 02:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033ed94b75a16969c8b7b3d13174ef3c SHA-1: 14cb27901d39988257da395cfff57ed33701dd88 SHA-256: 676b7ca1383311ec8882137d69a6224ae9ec3f4b1a21202ccd7256d3847380dc
162 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. Several of these links point to known malicious redirector infrastructure, indicating an attempt to direct users to harmful sites. The presence of a link farm suggests a broad phishing or malware distribution campaign.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.link/wix?keyword=python+vs+small+basic
    • http://files.cuastt.com/uploads/1/3/1/3/131398591/9247193.pdf
    • http://files.veljre.com/uploads/1/3/1/4/131409037/manepitejug.pdf
    • http://files.kensnowphotographer.com/uploads/1/3/0/7/130775588/bafolegemagokexif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24353d1b-6f74-4dbb-b253-891c29c5a8f6.filesusr.com/ugd/70e7d4_161000755c3e4688b8023683af4720d5.pdf?index=true
    • https://1a068b3d-0def-492f-8108-a593fbac1533.filesusr.com/ugd/234f58_74b2a23993c04e719e6598b03d6ee98b.pdf?index=true
    • https://bab55eb1-1d98-4bd0-bfd5-6396c9e60edb.filesusr.com/ugd/8c5bc8_cc622140f1344721a54ff7fb512c5e13.pdf?index=true
    • https://e09263a8-9900-4752-b250-3de66e789ca0.filesusr.com/ugd/b0c717_3ff9c94df59044d0b5edfad0c1d9ae76.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/oxford_bookworms_starter_sally_s_phone.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/poxesuveginuteva.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/19306530895.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/ielts_writing_task_2_answer_sheet_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/fumabisemon.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/febrile_neutropenia_idsa_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/50196977086.pdf
    • https://cdn.shopify.com/s/files/1/0465/0467/3430/files/volcano_box_driver_download_for_windows_7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fac.bin
a535c44619f414931b48e6f904d6c2139699421727997b76ec88075ed61b637d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAC 5244 bytes
font_01_sfnt_off0000716a.bin
db69247276189d1383d2ea3d768ba9471222567890a8fc82585bc49f6ebd3282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716A 10136 bytes

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