Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5010e70bb9f8ba2…

MALICIOUS

PDF

47.2 KB Created: 2020-07-12 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187888ea242db923be0117b2ed3240d3 SHA-1: 56cfb6d17655014c5ec041aac0ed2b447dd777f2 SHA-256: e5010e70bb9f8ba2740f9b46d4e1f8317fffd011e2584c67b530393ff4bfa47a
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link directs to a redirector service, which in turn leads to a search result page for 'behringer u phoria um2 driver mac'. This suggests a SEO poisoning or link farm attack designed to lure users to malicious sites under the guise of providing software drivers. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=behringer+u+phoria+um2+driver+mac
    • http://files.vendettanailbar.com/uploads/1/3/1/1/131164414/tolemelupoferow-sidalomimivilej.pdf
    • http://files.shopthevintagepeddler.com/uploads/1/3/0/7/130738484/575356.pdf
    • http://files.spartandecocrete.com/uploads/1/3/0/7/130738821/dusuworiwuxavuzu.pdf
    • http://files.guyingram.com/uploads/1/3/2/6/132681596/3295852.pdf
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdf
    • http://files.lifeintheglow.com/uploads/1/3/0/7/130775520/gazavajogorawi-gokivak-xosilizezuzupe.pdf
    • http://files.mikemarrone.com/uploads/1/3/1/3/131378816/vuzufufirola.pdf
    • https://womimoxik.files.wordpress.com/2020/06/55219449932.pdf
    • https://maforebe.files.wordpress.com/2020/07/56568337924.pdf
    • https://kulovop.files.wordpress.com/2020/06/vukokuwivusatukolulemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/zebumakepuperu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/19221618410.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/96066381090.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/voxefenafoxipil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9471/files/xewojarodasoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/rijuxonisarujowasive.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/xowamavexidodedetereg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f0.bin
33f227435edd8817185ee95042f41de2d8f7b0de0655459fab933607b3de2a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 5320 bytes
font_01_sfnt_off00008bd7.bin
30cd419a8a731ce82ba39927a6258c6091e082dc6d4735761cc054d0679839ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 10480 bytes

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