Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6323bcfa1a69d9…

MALICIOUS

PDF

35.7 KB Created: 2020-08-14 05:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c8cb9a0197a100af873ed60a2d9daba SHA-1: 9e73289c3bd6b5c9aa88be04bcb281f358f14ce4 SHA-256: 5b6323bcfa1a69d9053679241e1733d58127558b95e6ec4f92368c9fae5f1950
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 a link farm designed to manipulate search engine results. One prominent link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting an attempt to lure users to malicious content under the guise of a manual.

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/wb?keyword=heladera%20patrick%20manual%20de%20uso
    • http://files.greenrivermwc.com/uploads/1/3/0/9/130969939/bawezugu.pdf
    • http://kawufu.hisinsouthafrica.com/uploads/1/3/0/7/130776436/524582.pdf
    • http://files.rtcpro.com/uploads/1/3/1/3/131380126/gofuzi.pdf
    • http://deresu.writenotions.com/uploads/1/3/2/8/132814930/rafaretese-vilanazisen-bojugimazuxemab.pdf
    • http://tojaxil.cuttingedgedm.com/uploads/1/3/2/8/132814928/timivajomer-kokipibiso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/porodokewolixejalezoza.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/how_to_talk_in_vrchat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7749/files/jixafidiwilaxupokumu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/guselu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/35691032455.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/tinkers_construct_reinforced.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/calligraphy_brush_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kividerinogofigizunewif.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/an_appeal_to_heaven_book_dutch_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/9663/6580/files/28629921704.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3408/files/dafepawekiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/difference_between_accuracy_and_precision_in_physics.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_off00004cf3.bin
b757113b9c31629639fcbea15327d49ba26c7375d8a3b425be7dbf193d01252d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF3 5244 bytes
font_01_sfnt_off00005ea4.bin
0f9cd18e9ea48cd89a382a4f534bdf4d8b245d08a1202b60ea3b717b4c2345c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 10340 bytes

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