Malicious PDF — malware analysis report

Static analysis result for SHA-256 049fe9b3b8faf720…

MALICIOUS

PDF

47.5 KB Created: 2020-08-21 14:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1369cfeafe8186c23a588371c3c3fbde SHA-1: ec1269833fde6a0a7c1300ea0d811e71bba05277 SHA-256: 049fe9b3b8faf7204881457a9b30fb07cd12c06d9a54b8f2d66e9bed2edfc78d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to manipulate search engine results. One of the primary links, https://ttraff.cc/pify?keyword=android+tv+apps, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=android+tv+apps
    • http://mamovo.themillbrookhunt.com/uploads/1/3/1/6/131606490/xaparuwenezifimi.pdf
    • http://files.alysebonline.com/uploads/1/3/0/9/130968960/189a6c750.pdf
    • http://nareso.sirtomfoolery.com/uploads/1/3/0/7/130775692/wiwoliveda.pdf
    • http://files.cannonmadison.com/uploads/1/3/1/1/131164398/repinedew_nigegomeda_fetakukabad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0187/1512/files/broader_applications_of_arterial_pressure_waveform_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/7443/5737/files/easy_disney_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/oxidative_phosphorylation_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/46391222998.pdf
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/driver_asus_usb-_ac53_nano.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/zawumugalovifakejigesus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3206/8775/files/83757015424.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5854/files/5575267845.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/pagination_in_php.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/physics_formulas_for_class_9_and_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/music_concert_poster_design_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/3330547848.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/fubexolimajinitamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3765/files/10647600215.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_off00007d78.bin
7605172e33a19d5f77b3524f8f929b346c78d6e906edaa376d0d3694330f4b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 4972 bytes
font_01_sfnt_off00008e6d.bin
f21e266328dcf514a44096aab363367de28ba49b7b408e9989e2997cdca5115f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6D 10208 bytes

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