Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b619232a8d4fb9…

MALICIOUS

PDF

46.2 KB Created: 2020-08-05 02:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c096929787592a4f19ff5b15ac79b863 SHA-1: 70f5852f73d4dbfe957f9dd48547fc231f691a4a SHA-256: 81b619232a8d4fb9c3bbc2109fe1f0fd59542dc4a9cad506d90011684ad6e909
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate documents but lead to malicious infrastructure. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=canticos+de+alabanza+a+jehova+pdf, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=canticos+de+alabanza+a+jehova+pdf
    • http://bijakuna.southernalbertabowhuntersassociation.com/uploads/1/3/1/3/131380158/7180709.pdf
    • http://files.gagaballpit.com/uploads/1/3/1/3/131383386/6311490.pdf
    • http://palune.highpointoutfitters.com/uploads/1/3/0/8/130813509/0270a9ee.pdf
    • http://files.ctefaculty.com/uploads/1/3/2/6/132695839/2265389.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/47103267172.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/jirowigireravuberodufab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/convert_string_to_int_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/tosevufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21244882445.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/seziv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/mortal_kombat_x_cheats_ios.pdf
    • https://cdn.shopify.com/s/files/1/0434/1668/2663/files/zozowifesiwaxakidune.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.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_off00006b52.bin
15d95c0f9bd28b5556b38cfc44f65acb6ac9c4b3e7fc723d53e5d63b4fff7e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B52 5376 bytes
font_01_sfnt_off00007da5.bin
8500f233a588e127d7aa149df57296e5445afc859506d430b3654bcda2ba9c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA5 14668 bytes

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