Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baa9c83306c0436…

MALICIOUS

PDF

47.9 KB Created: 2020-08-06 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a92de0d70353442c881b20d5f7e278e SHA-1: 4798af729b255e94689329e19267ca7b5cb9d954 SHA-256: 1baa9c83306c043602a98d4551a14c168f0320f9c889e09ed1b8aef56de0a453
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, includes text related to 'Integral calculus work problems' and the URL that triggered the malicious redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. No scripts were extracted from this sample.

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=integral+calculus+work+problems+with+solutions+pdf
    • http://files.hannahvsthemany.com/uploads/1/3/2/6/132682754/59bd78a0.pdf
    • http://xepigefuw.houseofblackart.com/uploads/1/3/2/3/132302782/c78de0aa2.pdf
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdf
    • http://files.robertfreedmanagency.com/uploads/1/3/0/8/130873872/kewexatejakuwe-dolixopafisudat-lejagilefin-bobaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3408/files/assemblies_of_god_ghana_sunday_school_manual_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/padolasuserimud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/18877031548.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/goverabidejobod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/zadigamupixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/adverbs_of_probability_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/209868117.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/gasupatimu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/kibofij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/uninstall_mysql_server_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/biology_important_questions_for_class_12_state_board_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/58382108747.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4076/files/86371709685.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_off00007a0b.bin
3f4ce3b5ff33a0bee187b4493cf44bb16086dd3b045b3c9030bf64e5b364e24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0B 5804 bytes
font_01_sfnt_off00008db5.bin
74356cf8099eb3c1075a8629cafa758d2becf23cd251f57b1d59c1b81c655651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB5 10660 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.