Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fbdfbabad37928…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 05:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad644b6d151f6236e884bbd4f5a423b SHA-1: b6f4e06357214feda09248c1cb1b5cdbaaf7f2a9 SHA-256: 88fbdfbabad3792822822e6a8870618ce52f4c9e5c1089a7dc236889f1ca9bd8
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 benign content, but one prominent link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains a reference to the same malicious URL. This suggests an attempt to trick users into visiting a malicious site under the guise of providing educational worksheets.

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.com/pify?keyword=conversion+practice+worksheet+5th+grade
    • http://files.smeccinc.org/uploads/1/3/0/7/130775515/xipemonunevuvoniwolu.pdf
    • http://fonapid.texgermanshepherd.com/uploads/1/3/1/3/131383407/f866c96b1ddb11f.pdf
    • http://bemoxipob.deniseturu.com/uploads/1/3/1/4/131408100/1930318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/unicellular_and_multicellular_organisms_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0446/3457/0915/files/openstreetmap_baden-_wrttemberg_garmin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/bezuxutejatenuwejukire.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/18838741941.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/star_wars_the_roleplaying_game.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/porsche_cdr_30_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0453/2079/8363/files/tisase.pdf
    • https://cdn.shopify.com/s/files/1/0448/9232/3995/files/quantitative_aptitude_topics_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/bangalore_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/10583051081.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/bujadugetugema.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_off00006ef9.bin
20db697e5a58228b2a9c2493941ac5c50e0fdf1c993d545a27237155c5788842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF9 5548 bytes
font_01_sfnt_off000081dc.bin
d0cc5461f8d1c76b9e776c482de378fea2907143bb8e4cbbb183734c449af854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 10352 bytes

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