Malicious PDF — malware analysis report

Static analysis result for SHA-256 c182d020e9989f33…

MALICIOUS

PDF

34.8 KB Created: 2020-08-24 03:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 230c84a77269d827ed0775394f6429ab SHA-1: b9cf315b692dfc25edeb28f58cdce13cea7880b6 SHA-256: c182d020e9989f33745ecffa21dc1fa1595deba141e4a9547baee1073357b924
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=before+midnight+subtitles+english, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirection attempt.

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=before+midnight+subtitles+english
    • http://files.elkcreekbaptist.com/uploads/1/3/0/7/130776118/2dbf89da17.pdf
    • http://kuwel.cherylbeer.com/uploads/1/3/1/3/131380212/bfe304f28.pdf
    • http://files.pcomproperty.com/uploads/1/3/1/3/131379554/2464258.pdf
    • http://files.opus126.com/uploads/1/3/1/6/131606128/kuribawas-figaselilumawag.pdf
    • http://gusuli.katherineorchard.com/uploads/1/3/1/3/131383483/9c276d599602.pdf
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/50594339708.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1543/files/j_hope_chicken_noodle_soup_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/20622090688.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/faxeliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/asos_size_guide_us_to_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0274/files/92586191378.pdf
    • https://cdn.shopify.com/s/files/1/0465/3459/0614/files/36153574346.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/peridapizux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/3967155640.pdf
    • https://cdn.shopify.com/s/files/1/0436/1489/6290/files/1742812437.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/asterix_and_obelix_xxl_2_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3956/files/auditor_independence_and_audit_quality.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_off00004901.bin
fd82858f0fd95de8964fec5da42a6833f864cf46f733e0901a021be32d0d1bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4901 5300 bytes
font_01_sfnt_off00005add.bin
e49bf934e6d295b58db44e0eea6fff2612e2f6acd7b3616fed93210a200e8ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 10248 bytes

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